Table of Contents
334 relations: Accretion disk, Active galactic nucleus, Algol variable, Alinda asteroid, Alpha Cygni variable, Alpha2 Canum Venaticorum variable, Am star, Amor asteroid, Andromeda Galaxy, Angelo Secchi, Ap and Bp stars, Apollo asteroid, Arjuna asteroid, Asterism (astronomy), Asteroid, Asteroid belt, Asteroid family, Astronomy, Aten asteroid, Atira asteroid, Barium star, Barred spiral galaxy, Bedrock, Beta Cephei variable, Beta Lyrae, Binary asteroid, Binary black hole, Binary star, Black dwarf, Black hole, Blazar, Blitzar, Blue giant, Blue straggler, Blue supergiant, Bok globule, Bolide, Brightest cluster galaxy, Brown dwarf, Cambridge University Press, Carbon star, Cataclysmic variable star, Centaur (small Solar System body), Cepheid variable, Ceres (dwarf planet), Chemically peculiar star, Chthonian planet, Circumstellar disc, Classical Kuiper belt object, Co-orbital configuration, ... Expand index (284 more) »
- Astronomical objects
Accretion disk
An accretion disk is a structure (often a circumstellar disk) formed by diffuse material in orbital motion around a massive central body.
See Astronomical object and Accretion disk
Active galactic nucleus
An active galactic nucleus (AGN) is a compact region at the center of a galaxy that emits a significant amount of energy across the electromagnetic spectrum, with characteristics indicating that this luminosity is not produced by the stars.
See Astronomical object and Active galactic nucleus
Algol variable
Algol variables or Algol-type binaries are a class of eclipsing binary stars that are similar to the prototype member of this class, β Persei (Beta Persei, Algol).
See Astronomical object and Algol variable
Alinda asteroid
The Alinda asteroids are a dynamical group of asteroids with a semi-major axis of about 2.5 AU and an orbital eccentricity approximately between 0.4 and 0.65.
See Astronomical object and Alinda asteroid
Alpha Cygni variable
Alpha Cygni variables are variable stars which exhibit non-radial pulsations, meaning that some portions of the stellar surface are contracting at the same time other parts expand.
See Astronomical object and Alpha Cygni variable
Alpha2 Canum Venaticorum variable
An Alpha2 Canum Venaticorum variable (or α2 CVn variable) is a type of variable star.
See Astronomical object and Alpha2 Canum Venaticorum variable
Am star
An Am star or metallic-line star is a type of chemically peculiar star of spectral type A whose spectrum has strong and often variable absorption lines of metals such as zinc, strontium, zirconium, and barium, and deficiencies of others, such as calcium and scandium.
See Astronomical object and Am star
Amor asteroid
The Amor asteroids are a group of near-Earth asteroids named after the archetype object 1221 Amor.
See Astronomical object and Amor asteroid
Andromeda Galaxy
The Andromeda Galaxy is a barred spiral galaxy and is the nearest major galaxy to the Milky Way.
See Astronomical object and Andromeda Galaxy
Angelo Secchi
Angelo Secchi (28 June 1818 – 26 February 1878) was an Italian Catholic priest and astronomer from the Italian region of Emilia.
See Astronomical object and Angelo Secchi
Ap and Bp stars
Ap and Bp stars are chemically peculiar stars (hence the "p") of spectral types A and B which show overabundances of some metals, such as strontium, chromium, or europium.
See Astronomical object and Ap and Bp stars
Apollo asteroid
The Apollo asteroids are a group of near-Earth asteroids named after 1862 Apollo, discovered by German astronomer Karl Reinmuth in the 1930s.
See Astronomical object and Apollo asteroid
Arjuna asteroid
The Arjuna asteroids (also known as "Arjunas") are a dynamical group of asteroids in the Solar System.
See Astronomical object and Arjuna asteroid
Asterism (astronomy)
An asterism is an observed pattern or group of stars in the sky.
See Astronomical object and Asterism (astronomy)
Asteroid
An asteroid is a minor planet—an object that is neither a true planet nor an identified comet— that orbits within the inner Solar System.
See Astronomical object and Asteroid
Asteroid belt
The asteroid belt is a torus-shaped region in the Solar System, centered on the Sun and roughly spanning the space between the orbits of the planets Jupiter and Mars.
See Astronomical object and Asteroid belt
Asteroid family
An asteroid family is a population of asteroids that share similar proper orbital elements, such as semimajor axis, eccentricity, and orbital inclination.
See Astronomical object and Asteroid family
Astronomy
Astronomy is a natural science that studies celestial objects and the phenomena that occur in the cosmos.
See Astronomical object and Astronomy
Aten asteroid
The Aten asteroids are a dynamical group of asteroids whose orbits bring them into proximity with Earth.
See Astronomical object and Aten asteroid
Atira asteroid
Atira asteroids or Apohele asteroids, also known as interior-Earth objects (IEOs), are Near-Earth objects whose orbits are entirely confined within Earth's orbit; that is, their orbit has an aphelion (farthest point from the Sun) smaller than Earth's perihelion (nearest point to the Sun), which is 0.983 astronomical units (AU).
See Astronomical object and Atira asteroid
Barium star
Barium stars are spectral class G to K stars whose spectra indicate an overabundance of s-process elements by the presence of singly ionized barium, Ba II, at λ 455.4 nm.
See Astronomical object and Barium star
Barred spiral galaxy
A barred spiral galaxy is a spiral galaxy with a central bar-shaped structure composed of stars.
See Astronomical object and Barred spiral galaxy
Bedrock
In geology, bedrock is solid rock that lies under loose material (regolith) within the crust of Earth or another terrestrial planet.
See Astronomical object and Bedrock
Beta Cephei variable
Beta Cephei variables, also known as Beta Canis Majoris stars, are variable stars that exhibit small rapid variations in their brightness due to pulsations of the stars' surfaces, thought due to the unusual properties of iron at temperatures of 200,000 K in their interiors.
See Astronomical object and Beta Cephei variable
Beta Lyrae
Beta Lyrae (β Lyrae, abbreviated Beta Lyr, β Lyr) officially named Sheliak (Arabic: الشلياق, Romanization: ash-Shiliyāq) (IPA), the traditional name of the system, is a multiple star system in the constellation of Lyra.
See Astronomical object and Beta Lyrae
Binary asteroid
A binary asteroid is a system of two asteroids orbiting their common barycenter.
See Astronomical object and Binary asteroid
Binary black hole
A binary black hole (BBH), or black hole binary, is a system consisting of two black holes in close orbit around each other.
See Astronomical object and Binary black hole
Binary star
A binary star or binary star system is a system of two stars that are gravitationally bound to and in orbit around each other.
See Astronomical object and Binary star
Black dwarf
A black dwarf is a theoretical stellar remnant, specifically a white dwarf that has cooled sufficiently to no longer emit significant heat or light.
See Astronomical object and Black dwarf
Black hole
A black hole is a region of spacetime where gravity is so strong that nothing, not even light and other electromagnetic waves, is capable of possessing enough energy to escape it.
See Astronomical object and Black hole
Blazar
A blazar is an active galactic nucleus (AGN) with a relativistic jet (a jet composed of ionized matter traveling at nearly the speed of light) directed very nearly towards an observer.
See Astronomical object and Blazar
Blitzar
In astronomy, blitzars are a hypothetical type of neutron star, specifically pulsars that can rapidly collapse into black holes if their spinning slows down.
See Astronomical object and Blitzar
Blue giant
In astronomy, a blue giant is a hot star with a luminosity class of III (giant) or II (bright giant).
See Astronomical object and Blue giant
Blue straggler
A blue straggler is a type of star that is more luminous and bluer than expected.
See Astronomical object and Blue straggler
Blue supergiant
A blue supergiant (BSG) is a hot, luminous star, often referred to as an OB supergiant.
See Astronomical object and Blue supergiant
Bok globule
In astronomy, Bok globules are isolated and relatively small dark nebulae containing dense cosmic dust and gas from which star formation may take place.
See Astronomical object and Bok globule
Bolide
A bolide is normally taken to mean an exceptionally bright meteor, but the term is subject to more than one definition, according to context.
See Astronomical object and Bolide
Brightest cluster galaxy
A brightest cluster galaxy (BCG) is defined as the brightest galaxy in a cluster of galaxies.
See Astronomical object and Brightest cluster galaxy
Brown dwarf
Brown dwarfs are substellar objects that have more mass than the biggest gas giant planets, but less than the least massive main-sequence stars.
See Astronomical object and Brown dwarf
Cambridge University Press
Cambridge University Press is the university press of the University of Cambridge.
See Astronomical object and Cambridge University Press
Carbon star
A carbon star (C-type star) is typically an asymptotic giant branch star, a luminous red giant, whose atmosphere contains more carbon than oxygen.
See Astronomical object and Carbon star
Cataclysmic variable star
In astronomy, cataclysmic variable stars (CVs) are stars which irregularly increase in brightness by a large factor, then drop back down to a quiescent state.
See Astronomical object and Cataclysmic variable star
Centaur (small Solar System body)
In planetary astronomy, a centaur is a small Solar System body that orbits the Sun between Jupiter and Neptune and crosses the orbits of one or more of the giant planets.
See Astronomical object and Centaur (small Solar System body)
Cepheid variable
A Cepheid variable is a type of variable star that pulsates radially, varying in both diameter and temperature.
See Astronomical object and Cepheid variable
Ceres (dwarf planet)
Ceres (minor-planet designation: 1 Ceres) is a dwarf planet in the middle main asteroid belt between the orbits of Mars and Jupiter.
See Astronomical object and Ceres (dwarf planet)
Chemically peculiar star
In astrophysics, chemically peculiar stars (CP stars) are stars with distinctly unusual metal abundances, at least in their surface layers.
See Astronomical object and Chemically peculiar star
Chthonian planet
Chthonian planets (sometimes 'cthonian') are a hypothetical class of celestial objects resulting from the stripping away of a gas giant's hydrogen and helium atmosphere and outer layers, which is called hydrodynamic escape.
See Astronomical object and Chthonian planet
Circumstellar disc
A circumstellar disc (or circumstellar disk) is a torus, pancake or ring-shaped accretion disk of matter composed of gas, dust, planetesimals, asteroids, or collision fragments in orbit around a star.
See Astronomical object and Circumstellar disc
Classical Kuiper belt object
A classical Kuiper belt object, also called a cubewano ("QB1-o"), is a low-eccentricity Kuiper belt object (KBO) that orbits beyond Neptune and is not controlled by an orbital resonance with Neptune.
See Astronomical object and Classical Kuiper belt object
Co-orbital configuration
In astronomy, a co-orbital configuration is a configuration of two or more astronomical objects (such as asteroids, moons, or planets) orbiting at the same, or very similar, distance from their primary; i.e., they are in a 1:1 mean-motion resonance.
See Astronomical object and Co-orbital configuration
Coma (comet)
The coma is the nebulous envelope around the nucleus of a comet, formed when the comet passes near the Sun in its highly elliptical orbit.
See Astronomical object and Coma (comet)
Comet
A comet is an icy, small Solar System body that warms and begins to release gases when passing close to the Sun, a process called outgassing. Astronomical object and comet are astronomical objects.
See Astronomical object and Comet
Comet nucleus
The nucleus is the solid, central part of a comet, formerly termed a dirty snowball or an icy dirtball.
See Astronomical object and Comet nucleus
Comet tail
A comet tail and coma are visible features of a comet when they are illuminated by the Sun and may become visible from Earth when a comet passes through the inner Solar System.
See Astronomical object and Comet tail
Compact object
In astronomy, the term compact object (or compact star) refers collectively to white dwarfs, neutron stars, and black holes.
See Astronomical object and Compact object
Constellation
A constellation is an area on the celestial sphere in which a group of visible stars forms a perceived pattern or outline, typically representing an animal, mythological subject, or inanimate object.
See Astronomical object and Constellation
Contact binary
In astronomy, a contact binary is a binary star system whose component stars are so close that they touch each other or have merged to share their gaseous envelopes.
See Astronomical object and Contact binary
Contact binary (small Solar System body)
A contact binary is a small Solar System body, such as a minor planet or comet, that is composed of two bodies that have gravitated toward each other until they touch, resulting in a bilobated, peanut-like overall shape.
See Astronomical object and Contact binary (small Solar System body)
Cosmic dust
Cosmic dustalso called extraterrestrial dust, space dust, or star dustis dust that occurs in outer space or has fallen onto Earth. Astronomical object and Cosmic dust are astronomical objects.
See Astronomical object and Cosmic dust
Cosmic microwave background
The cosmic microwave background (CMB or CMBR) is microwave radiation that fills all space in the observable universe.
See Astronomical object and Cosmic microwave background
Cosmic string
Cosmic strings are hypothetical 1-dimensional topological defects which may have formed during a symmetry-breaking phase transition in the early universe when the topology of the vacuum manifold associated to this symmetry breaking was not simply connected.
See Astronomical object and Cosmic string
Cosmology
Cosmology is a branch of physics and metaphysics dealing with the nature of the universe, the cosmos.
See Astronomical object and Cosmology
Culture
Culture is a concept that encompasses the social behavior, institutions, and norms found in human societies, as well as the knowledge, beliefs, arts, laws, customs, capabilities, and habits of the individuals in these groups.
See Astronomical object and Culture
Cybele asteroids
The Cybele asteroids (also known as the "Cybeles") are a dynamical group of asteroids, named after the asteroid 65 Cybele.
See Astronomical object and Cybele asteroids
Damocloid
Damocloids are a class of minor planets such as 5335 Damocles and 1996 PW that have Halley-type or long-period highly eccentric orbits typical of periodic comets such as Halley's Comet, but without showing a cometary coma or tail.
See Astronomical object and Damocloid
Dark galaxy
A dark galaxy is a hypothesized galaxy with no (or very few) stars.
See Astronomical object and Dark galaxy
Dark matter
In astronomy, dark matter is a hypothetical form of matter that appears not to interact with light or the electromagnetic field.
See Astronomical object and Dark matter
Dark nebula
A dark nebula or absorption nebula is a type of interstellar cloud, particularly molecular clouds, that is so dense that it obscures the visible wavelengths of light from objects behind it, such as background stars and emission or reflection nebulae.
See Astronomical object and Dark nebula
Debris disk
A debris disk (American English), or debris disc (Commonwealth English), is a circumstellar disk of dust and debris in orbit around a star.
See Astronomical object and Debris disk
Deity
A deity or god is a supernatural being considered to be sacred and worthy of worship due to having authority over the universe, nature or human life.
See Astronomical object and Deity
Delta Scuti variable
A Delta Scuti variable (sometimes termed dwarf cepheid when the V-band amplitude is larger than 0.3 mag.) is a subclass of young pulsating star.
See Astronomical object and Delta Scuti variable
Detached object
Detached objects are a dynamical class of minor planets in the outer reaches of the Solar System and belong to the broader family of trans-Neptunian objects (TNOs).
See Astronomical object and Detached object
Disc galaxy
A disc galaxy (or disk galaxy) is a galaxy characterized by a galactic disc.
See Astronomical object and Disc galaxy
Domain wall (string theory)
In string theory, a domain wall is a theoretical (d−1)-dimensional singularity.
See Astronomical object and Domain wall (string theory)
Double star
In observational astronomy, a double star or visual double is a pair of stars that appear close to each other as viewed from Earth, especially with the aid of optical telescopes.
See Astronomical object and Double star
Dwarf galaxy
A dwarf galaxy is a small galaxy composed of about 1000 up to several billion stars, as compared to the Milky Way's 200–400 billion stars.
See Astronomical object and Dwarf galaxy
Dwarf nova
A dwarf nova (pl. novae), or U Geminorum variable, is one of several types of cataclysmic variable star, consisting of a close binary star system in which one of the components is a white dwarf that accretes matter from its companion.
See Astronomical object and Dwarf nova
Dwarf planet
A dwarf planet is a small planetary-mass object that is in direct orbit around the Sun, massive enough to be gravitationally rounded, but insufficient to achieve orbital dominance like the eight classical planets of the Solar System.
See Astronomical object and Dwarf planet
Dysnomia (moon)
Dysnomia (formally (136199) Eris I Dysnomia) is the only known moon of the dwarf planet Eris and is the second-largest known moon of a dwarf planet, after Pluto I Charon.
See Astronomical object and Dysnomia (moon)
Earth
Earth is the third planet from the Sun and the only astronomical object known to harbor life.
See Astronomical object and Earth
Earth analog
An Earth analog, also called an Earth analogue, Earth twin, or second Earth, is a planet or moon with environmental conditions similar to those found on Earth.
See Astronomical object and Earth analog
Earth trojan
An Earth trojan is an asteroid that orbits the Sun in the vicinity of the Earth–Sun Lagrangian points (leading 60°) or (trailing 60°), thus having an orbit similar to Earth's.
See Astronomical object and Earth trojan
Eccentric Jupiter
An eccentric Jupiter is a Jovian planet that orbits its star in an eccentric orbit.
See Astronomical object and Eccentric Jupiter
Edmond Halley
Edmond (or Edmund) Halley (–) was an English astronomer, mathematician and physicist.
See Astronomical object and Edmond Halley
Edwin Hubble
Edwin Powell Hubble (November 20, 1889 – September 28, 1953) was an American astronomer.
See Astronomical object and Edwin Hubble
Ejnar Hertzsprung
Ejnar Hertzsprung (8 October 1873 – 21 October 1967) was a Danish chemist and astronomer.
See Astronomical object and Ejnar Hertzsprung
Elliptical galaxy
An elliptical galaxy is a type of galaxy with an approximately ellipsoidal shape and a smooth, nearly featureless image.
See Astronomical object and Elliptical galaxy
Emission nebula
An emission nebula is a nebula formed of ionized gases that emit light of various wavelengths.
See Astronomical object and Emission nebula
Eos family
The Eos family (adj. Eoan) is a very large asteroid family located in the outer region of the asteroid belt.
See Astronomical object and Eos family
Eris (dwarf planet)
Eris (minor-planet designation: 136199 Eris) is the most massive and second-largest known dwarf planet in the Solar System.
See Astronomical object and Eris (dwarf planet)
Europe
Europe is a continent located entirely in the Northern Hemisphere and mostly in the Eastern Hemisphere.
See Astronomical object and Europe
Exocomet
An exocomet, or extrasolar comet, is a comet outside the Solar System, which includes rogue comets and comets that orbit stars other than the Sun.
See Astronomical object and Exocomet
Exomoon
access-date.
See Astronomical object and Exomoon
Exoplanet
An exoplanet or extrasolar planet is a planet outside the Solar System.
See Astronomical object and Exoplanet
Exotic star
An exotic star is a hypothetical compact star composed of exotic matter (something not made of electrons, protons, neutrons, or muons), and balanced against gravitational collapse by degeneracy pressure or other quantum properties.
See Astronomical object and Exotic star
Eyeball planet
An eyeball planet is a hypothetical type of tidally locked planet, for which tidal locking induces spatial features (for example in the geography or composition of the planet) resembling an eyeball.
See Astronomical object and Eyeball planet
Failed supernova
A failed supernova is an astronomical event in time domain astronomy in which a star suddenly brightens as in the early stage of a supernova, but then does not increase to the massive flux of a supernova.
See Astronomical object and Failed supernova
Flare star
A flare star is a variable star that can undergo unpredictable dramatic increases in brightness for a few minutes.
See Astronomical object and Flare star
Flora family
The Flora family (adj. Florian;; also known as the Ariadne family) is a prominent family of stony asteroids located in the inner region of the asteroid belt.
See Astronomical object and Flora family
Fluid
In physics, a fluid is a liquid, gas, or other material that may continuously move and deform (flow) under an applied shear stress, or external force.
See Astronomical object and Fluid
FU Orionis star
In stellar evolution, an FU Orionis star (also FU Orionis object, or FUor) is a pre–main-sequence star which displays an extreme change in magnitude and spectral type.
See Astronomical object and FU Orionis star
Galactic bulge
In astronomy, a galactic bulge (or simply bulge) is a tightly packed group of stars within a larger star formation.
See Astronomical object and Galactic bulge
Galactic corona
The terms galactic corona and gaseous corona have been used in the first decade of the 21st century to describe a hot, ionised, gaseous component in the galactic halo of the Milky Way.
See Astronomical object and Galactic corona
Galactic halo
A galactic halo is an extended, roughly spherical component of a galaxy which extends beyond the main, visible component.
See Astronomical object and Galactic halo
Galaxy
A galaxy is a system of stars, stellar remnants, interstellar gas, dust, and dark matter bound together by gravity.
See Astronomical object and Galaxy
Galaxy filament
In cosmology, galaxy filaments are the largest known structures in the universe, consisting of walls of galactic superclusters.
See Astronomical object and Galaxy filament
Galaxy groups and clusters
Galaxy groups and clusters are the largest known gravitationally bound objects to have arisen thus far in the process of cosmic structure formation.
See Astronomical object and Galaxy groups and clusters
Galaxy merger
Galaxy mergers can occur when two (or more) galaxies collide.
See Astronomical object and Galaxy merger
Galaxy morphological classification
Galaxy morphological classification is a system used by astronomers to divide galaxies into groups based on their visual appearance.
See Astronomical object and Galaxy morphological classification
Galilean moons
The Galilean moons, or Galilean satellites, are the four largest moons of Jupiter: Io, Europa, Ganymede, and Callisto.
See Astronomical object and Galilean moons
Galileo Galilei
Galileo di Vincenzo Bonaiuti de' Galilei (15 February 1564 – 8 January 1642), commonly referred to as Galileo Galilei or simply Galileo, was an Italian astronomer, physicist and engineer, sometimes described as a polymath.
See Astronomical object and Galileo Galilei
Gamma-ray burst
In gamma-ray astronomy, gamma-ray bursts (GRBs) are immensely energetic explosions that have been observed in distant galaxies, being the brightest and most extreme explosive events in the entire universe, as NASA describes the bursts as the "most powerful class of explosions in the universe".
See Astronomical object and Gamma-ray burst
Gas giant
A gas giant is a giant planet composed mainly of hydrogen and helium.
See Astronomical object and Gas giant
Giant planet
A giant planet, sometimes referred to as a jovian planet (Jove being another name for the Roman god Jupiter), is a diverse type of planet much larger than Earth.
See Astronomical object and Giant planet
Giant star
A giant star has a substantially larger radius and luminosity than a main-sequence (or dwarf) star of the same surface temperature.
See Astronomical object and Giant star
Giordano Bruno
Giordano Bruno (Iordanus Brunus Nolanus; born Filippo Bruno, January or February 1548 – 17 February 1600) was an Italian philosopher, poet, alchemist, astronomer, cosmological theorist, and esotericist.
See Astronomical object and Giordano Bruno
Globular cluster
A globular cluster is a spheroidal conglomeration of stars that is bound together by gravity, with a higher concentration of stars towards its center.
See Astronomical object and Globular cluster
H I region
An HI region or H I region (read H one) is a cloud in the interstellar medium composed of neutral atomic hydrogen (HI), in addition to the local abundance of helium and other elements.
See Astronomical object and H I region
H II region
An H II region or HII region is a region of interstellar atomic hydrogen that is ionized.
See Astronomical object and H II region
Halley's Comet
Halley's Comet is the only known short-period comet that is consistently visible to the naked eye from Earth, appearing every 72–80 years.
See Astronomical object and Halley's Comet
Haumea
Haumea (minor-planet designation: 136108 Haumea) is a dwarf planet located beyond Neptune's orbit.
See Astronomical object and Haumea
Heliocentrism
Heliocentrism (also known as the heliocentric model) is a superseded astronomical model in which the Earth and planets revolve around the Sun at the center of the universe.
See Astronomical object and Heliocentrism
Heliosphere
The heliosphere is the magnetosphere, astrosphere, and outermost atmospheric layer of the Sun.
See Astronomical object and Heliosphere
Henry Norris Russell
Henry Norris Russell ForMemRS HFRSE FRAS (October 25, 1877 – February 18, 1957) was an American astronomer who, along with Ejnar Hertzsprung, developed the Hertzsprung–Russell diagram (1910).
See Astronomical object and Henry Norris Russell
Hertzsprung–Russell diagram
The Hertzsprung–Russell diagram (abbreviated as H–R diagram, HR diagram or HRD) is a scatter plot of stars showing the relationship between the stars' absolute magnitudes or luminosities and their stellar classifications or effective temperatures.
See Astronomical object and Hertzsprung–Russell diagram
Hilda asteroid
The Hilda asteroids (adj. Hildian) are a dynamical group of more than 5,000 asteroids located beyond the asteroid belt but within Jupiter's orbit, in a 3:2 orbital resonance with Jupiter.
See Astronomical object and Hilda asteroid
Hills cloud
In astronomy, the Hills cloud (also called the inner Oort cloud and inner cloud) is a theoretical vast circumstellar disc, interior to the Oort cloud, whose outer border would be located at around 20,000 to 30,000 astronomical units (AU) from the Sun, and whose inner border, less well defined, is hypothetically located at, well beyond planetary and Kuiper Belt object orbits—but distances might be much greater.
See Astronomical object and Hills cloud
Hot Jupiter
Hot Jupiters (sometimes called hot Saturns) are a class of gas giant exoplanets that are inferred to be physically similar to Jupiter but that have very short orbital periods (.
See Astronomical object and Hot Jupiter
Hot Neptune
A hot Neptune is a type of giant planet with a mass similar to that of Neptune or Uranus orbiting close to its star, normally within less than 1 AU.
See Astronomical object and Hot Neptune
Hungaria family
The Hungaria family (003) is a collisional asteroid family of at least 2,966 known asteroids, named for its largest member, the -across asteroid 434 Hungaria.
See Astronomical object and Hungaria family
Hydrostatic equilibrium
In fluid mechanics, hydrostatic equilibrium (hydrostatic balance, hydrostasy) is the condition of a fluid or plastic solid at rest, which occurs when external forces, such as gravity, are balanced by a pressure-gradient force.
See Astronomical object and Hydrostatic equilibrium
Hygiea family
The Hygiea or Hygiean family is a grouping of dark, carbonaceous C-type and B-type asteroids in outer asteroid belt, the largest member of which is 10 Hygiea.
See Astronomical object and Hygiea family
Hypercompact stellar system
A hypercompact stellar system (HCSS) is a dense cluster of stars around a supermassive black hole that has been ejected from the center of its host galaxy.
See Astronomical object and Hypercompact stellar system
Hypergiant
A hypergiant (luminosity class 0 or Ia+) is a very rare type of star that has an extremely high luminosity, mass, size and mass loss because of its extreme stellar winds.
See Astronomical object and Hypergiant
Hypernova
A hypernova is a very energetic supernova which is believed to result from an extreme core collapse scenario.
See Astronomical object and Hypernova
IAU definition of planet
The International Astronomical Union (IAU) defined in August 2006 that, in the Solar System, a planet is a celestial body that.
See Astronomical object and IAU definition of planet
Ice giant
An ice giant is a giant planet composed mainly of elements heavier than hydrogen and helium, such as oxygen, carbon, nitrogen, and sulfur.
See Astronomical object and Ice giant
Instability strip
The unqualified term instability strip usually refers to a region of the Hertzsprung–Russell diagram largely occupied by several related classes of pulsating variable stars: Delta Scuti variables, SX Phoenicis variables, and rapidly oscillating Ap stars (roAps) near the main sequence; RR Lyrae variables where it intersects the horizontal branch; and the Cepheid variables where it crosses the supergiants.
See Astronomical object and Instability strip
Interacting galaxy
Interacting galaxies (colliding galaxies) are galaxies whose gravitational fields result in a disturbance of one another.
See Astronomical object and Interacting galaxy
Intergalactic dust
Intergalactic dust is cosmic dust in between galaxies in intergalactic space.
See Astronomical object and Intergalactic dust
Intermediate-mass black hole
An intermediate-mass black hole (IMBH) is a class of black hole with mass in the range 102–105 solar masses: significantly higher than stellar black holes but lower than the 105–109 solar mass supermassive black holes.
See Astronomical object and Intermediate-mass black hole
Interplanetary dust cloud
The interplanetary dust cloud, or zodiacal cloud (as the source of the zodiacal light), consists of cosmic dust (small particles floating in outer space) that pervades the space between planets within planetary systems, such as the Solar System.
See Astronomical object and Interplanetary dust cloud
Interplanetary magnetic field
The interplanetary magnetic field (IMF), now more commonly referred to as the heliospheric magnetic field (HMF), is the component of the solar magnetic field that is dragged out from the solar corona by the solar wind flow to fill the Solar System.
See Astronomical object and Interplanetary magnetic field
Interplanetary medium
The interplanetary medium (IPM) or interplanetary space consists of the mass and energy which fills the Solar System, and through which all the larger Solar System bodies, such as planets, dwarf planets, asteroids, and comets, move.
See Astronomical object and Interplanetary medium
Interstellar cloud
An Interstellar Cloud is generally an accumulation of gas, plasma, and dust in our and other galaxies.
See Astronomical object and Interstellar cloud
Interstellar medium
The interstellar medium (ISM) is the matter and radiation that exists in the space between the star systems in a galaxy.
See Astronomical object and Interstellar medium
Iron star
In astronomy, an iron star is a hypothetical type of compact star.
See Astronomical object and Iron star
Irregular galaxy
An irregular galaxy is a galaxy that does not have a distinct regular shape, unlike a spiral or an elliptical galaxy.
See Astronomical object and Irregular galaxy
Irregular variable
An irregular variable is a type of variable star in which variations in brightness show no regular periodicity.
See Astronomical object and Irregular variable
Johannes Kepler
Johannes Kepler (27 December 1571 – 15 November 1630) was a German astronomer, mathematician, astrologer, natural philosopher and writer on music.
See Astronomical object and Johannes Kepler
Joseph von Fraunhofer
Joseph Ritter von Fraunhofer (6 March 1787 – 7 June 1826) was a German physicist and optical lens manufacturer.
See Astronomical object and Joseph von Fraunhofer
Jupiter
Jupiter is the fifth planet from the Sun and the largest in the Solar System.
See Astronomical object and Jupiter
Jupiter trojan
The Jupiter trojans, commonly called trojan asteroids or simply trojans, are a large group of asteroids that share the planet Jupiter's orbit around the Sun.
See Astronomical object and Jupiter trojan
Kepler's laws of planetary motion
In astronomy, Kepler's laws of planetary motion, published by Johannes Kepler between 1609 and 1619, describe the orbits of planets around the Sun.
See Astronomical object and Kepler's laws of planetary motion
Koronis family
The Koronis or Koronian family, also known as the Lacrimosa family, is a very large asteroid family of stony asteroids, located in the outer region of the asteroid belt.
See Astronomical object and Koronis family
Kuiper belt
The Kuiper belt is a circumstellar disc in the outer Solar System, extending from the orbit of Neptune at 30 astronomical units (AU) to approximately 50 AU from the Sun.
See Astronomical object and Kuiper belt
Large quasar group
A large quasar group (LQG) is a collection of quasars (a form of supermassive black hole active galactic nuclei) that form what are thought to constitute the largest astronomical structures in the observable universe.
See Astronomical object and Large quasar group
Lenticular galaxy
A lenticular galaxy (denoted S0) is a type of galaxy intermediate between an elliptical (denoted E) and a spiral galaxy in galaxy morphological classification schemes.
See Astronomical object and Lenticular galaxy
List of light sources
This is a list of sources of light, the visible part of the electromagnetic spectrum.
See Astronomical object and List of light sources
List of Mars-crossing minor planets
A Mars-crossing asteroid (MCA, also Mars-crosser, MC) is an asteroid whose orbit crosses that of Mars.
See Astronomical object and List of Mars-crossing minor planets
List of natural satellites
Of the Solar System's eight planets and its nine most likely dwarf planets, six planets and seven dwarf planets are known to be orbited by at least 300 natural satellites, or moons.
See Astronomical object and List of natural satellites
List of possible dwarf planets
The number of dwarf planets in the Solar System is unknown.
See Astronomical object and List of possible dwarf planets
List of Solar System objects
The following is a list of Solar System objects by orbit, ordered by increasing distance from the Sun.
See Astronomical object and List of Solar System objects
List of Solar System objects by size
This article includes a list of the most massive known objects of the Solar System and partial lists of smaller objects by observed mean radius.
See Astronomical object and List of Solar System objects by size
Lists of astronomical objects
This is a list of lists, grouped by type of astronomical object. Astronomical object and lists of astronomical objects are astronomical objects.
See Astronomical object and Lists of astronomical objects
Luminous blue variable
Luminous blue variables (LBVs) are massive evolved stars that show unpredictable and sometimes dramatic variations in their spectra and brightness.
See Astronomical object and Luminous blue variable
Magnetar
A magnetar is a type of neutron star with an extremely powerful magnetic field (~109 to 1011 T, ~1013 to 1015 G).
See Astronomical object and Magnetar
Main sequence
In astronomy, the main sequence is a classification of stars which appear on plots of stellar color versus brightness as a continuous and distinctive band.
See Astronomical object and Main sequence
Makemake
Makemake (minor-planet designation: 136472 Makemake) is a dwarf planet and the second-largest of what is known as the classical population of Kuiper belt objects, with a diameter approximately that of Saturn's moon Iapetus, or 60% that of Pluto.
See Astronomical object and Makemake
Maria family
The Maria family (adj. Marian; FIN: 506; also known as the Roma family) is a collisional asteroid family located in the inner parts of the intermediate asteroid belt, near the 1:3 Kirkwood gap.
See Astronomical object and Maria family
Mars
Mars is the fourth planet from the Sun.
See Astronomical object and Mars
Mars trojan
The Mars trojans are a group of trojan objects that share the orbit of the planet Mars around the Sun.
See Astronomical object and Mars trojan
Massive compact halo object
A MAssive Compact Halo Object (MACHO) is a kind of astronomical body that might explain the apparent presence of dark matter in galaxy halos.
See Astronomical object and Massive compact halo object
Mercury (planet)
Mercury is the first planet from the Sun and the smallest in the Solar System.
See Astronomical object and Mercury (planet)
Meteoroid
A meteoroid is a small rocky or metallic body in outer space.
See Astronomical object and Meteoroid
Micrometeoroid
A micrometeoroid is a tiny meteoroid: a small particle of rock in space, usually weighing less than a gram.
See Astronomical object and Micrometeoroid
Micronova
A micronova is a putative type of thermonuclear explosion on the surface of a white dwarf much smaller than the strength of a nova; being about in strength, about a millionth that of a typical nova.
See Astronomical object and Micronova
Microquasar
A microquasar, the smaller version of a quasar, is a compact region surrounding a stellar black hole with a mass several times that of its companion star.
See Astronomical object and Microquasar
Middle Ages
In the history of Europe, the Middle Ages or medieval period (also spelt mediaeval or mediæval) lasted from approximately 500 to 1500 AD.
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Middle East
The Middle East (term originally coined in English Translations of this term in some of the region's major languages include: translit; translit; translit; script; translit; اوْرتاشرق; Orta Doğu.) is a geopolitical region encompassing the Arabian Peninsula, the Levant, Turkey, Egypt, Iran, and Iraq.
See Astronomical object and Middle East
Milky Way
The Milky Way is the galaxy that includes the Solar System, with the name describing the galaxy's appearance from Earth: a hazy band of light seen in the night sky formed from stars that cannot be individually distinguished by the naked eye.
See Astronomical object and Milky Way
Minor planet
According to the International Astronomical Union (IAU), a minor planet is an astronomical object in direct orbit around the Sun that is exclusively classified as neither a planet nor a comet.
See Astronomical object and Minor planet
Minor-planet moon
A minor-planet moon is an astronomical object that orbits a minor planet as its natural satellite.
See Astronomical object and Minor-planet moon
Mira variable
Mira variables (named for the prototype star Mira) are a class of pulsating stars characterized by very red colours, pulsation periods longer than 100 days, and amplitudes greater than one magnitude in infrared and 2.5 magnitude at visual wavelengths.
See Astronomical object and Mira variable
Molecular cloud
A molecular cloud, sometimes called a stellar nursery (if star formation is occurring within), is a type of interstellar cloud, the density and size of which permit absorption nebulae, the formation of molecules (most commonly molecular hydrogen, H2), and the formation of H II regions.
See Astronomical object and Molecular cloud
Moon
The Moon is Earth's only natural satellite.
See Astronomical object and Moon
Moonlet
A moonlet, minor moon, minor natural satellite, or minor satellite is a particularly small natural satellite orbiting a planet, dwarf planet, or other minor planet.
See Astronomical object and Moonlet
Moons of Haumea
The dwarf planet Haumea has two known moons, Hiʻiaka and Namaka, named after Hawaiian goddesses.
See Astronomical object and Moons of Haumea
Moons of Jupiter
There are 95 moons of Jupiter with confirmed orbits.
See Astronomical object and Moons of Jupiter
Moons of Mars
The two moons of Mars are Phobos and Deimos.
See Astronomical object and Moons of Mars
Moons of Neptune
The planet Neptune has 16 known moons, which are named for minor water deities and a water creature in Greek mythology.
See Astronomical object and Moons of Neptune
Moons of Pluto
The dwarf planet Pluto has five natural satellites.
See Astronomical object and Moons of Pluto
Moons of Saturn
The moons of Saturn are numerous and diverse, ranging from tiny moonlets only tens of meters across to the enormous Titan, which is larger than the planet Mercury.
See Astronomical object and Moons of Saturn
Moons of Uranus
Uranus, the seventh planet of the Solar System, has 28 confirmed moons.
See Astronomical object and Moons of Uranus
Natural satellite
A natural satellite is, in the most common usage, an astronomical body that orbits a planet, dwarf planet, or small Solar System body (or sometimes another natural satellite).
See Astronomical object and Natural satellite
Near-Earth object
A near-Earth object (NEO) is any small Solar System body orbiting the Sun whose closest approach to the Sun (perihelion) is less than 1.3 times the Earth–Sun distance (astronomical unit, AU).
See Astronomical object and Near-Earth object
Nebula
A nebula (cloud, fog;: nebulae, nebulæ, or nebulas) is a distinct luminescent part of interstellar medium, which can consist of ionized, neutral, or molecular hydrogen and also cosmic dust.
See Astronomical object and Nebula
Neptune
Neptune is the eighth and farthest known planet from the Sun.
See Astronomical object and Neptune
Neptune trojan
Neptune trojans are bodies that orbit the Sun near one of the stable Lagrangian points of Neptune, similar to the trojans of other planets.
See Astronomical object and Neptune trojan
Neutron star
A neutron star is the collapsed core of a massive supergiant star.
See Astronomical object and Neutron star
Nicolaus Copernicus
Nicolaus Copernicus (19 February 1473 – 24 May 1543) was a Renaissance polymath, active as a mathematician, astronomer, and Catholic canon, who formulated a model of the universe that placed the Sun rather than Earth at its center.
See Astronomical object and Nicolaus Copernicus
Nova
A nova (novae or novas) is a transient astronomical event that causes the sudden appearance of a bright, apparently "new" star (hence the name "nova", Latin for "new") that slowly fades over weeks or months.
See Astronomical object and Nova
Nysa family
The Nysa family (adj. Nysian; FIN: 405) is part of the Nysa–Polana complex, the largest cluster of asteroid families in the asteroid belt.
See Astronomical object and Nysa family
Observable universe
The observable universe is a ball-shaped region of the universe consisting of all matter that can be observed from Earth or its space-based telescopes and exploratory probes at the present time; the electromagnetic radiation from these objects has had time to reach the Solar System and Earth since the beginning of the cosmological expansion.
See Astronomical object and Observable universe
Ocean world
An ocean world, ocean planet or water world is a type of planet that contains a substantial amount of water in the form of oceans, as part of its hydrosphere, either beneath the surface, as subsurface oceans, or on the surface, potentially submerging all dry land.
See Astronomical object and Ocean world
Odd radio circle
In astronomy, an odd radio circle (ORC) is a very large (over 50 thousand times the diameter of our Milky Way ~ 3 Million Light-years) unexplained astronomical object that, at radio wavelengths, is highly circular and brighter along its edges.
See Astronomical object and Odd radio circle
Oort cloud
The Oort cloud, sometimes called the Öpik–Oort cloud, is theorized to be a vast cloud of icy planetesimals surrounding the Sun at distances ranging from 2,000 to 200,000 AU (0.03 to 3.2 light-years).
See Astronomical object and Oort cloud
Orbital elements
Orbital elements are the parameters required to uniquely identify a specific orbit.
See Astronomical object and Orbital elements
Outer space
Outer space (or simply space) is the expanse that exists beyond Earth's atmosphere and between celestial bodies.
See Astronomical object and Outer space
OVV quasar
An optically violent variable quasar (often abbreviated as OVV quasar) is a type of highly variable quasar.
See Astronomical object and OVV quasar
Oxford University Press
Oxford University Press (OUP) is the publishing house of the University of Oxford.
See Astronomical object and Oxford University Press
P Cygni
P Cygni (34 Cygni) is a variable star in the constellation Cygnus.
See Astronomical object and P Cygni
Pallas family
The Pallas family (adj. Palladian) is a small asteroid family of B-type asteroids at very high inclinations in the intermediate asteroid belt.
See Astronomical object and Pallas family
Philip Childs Keenan
Philip Childs Keenan (March 31, 1908 – April 20, 2000) was an American astronomer.
See Astronomical object and Philip Childs Keenan
Phocaea family
The Phocaea family (adj. Phocaean) is a collisional family of asteroids located between 2.25 and 2.5 AU in the inner region of the asteroid belt.
See Astronomical object and Phocaea family
Photoelectric effect
The photoelectric effect is the emission of electrons from a material caused by electromagnetic radiation such as ultraviolet light.
See Astronomical object and Photoelectric effect
Photometer
A photometer is an instrument that measures the strength of electromagnetic radiation in the range from ultraviolet to infrared and including the visible spectrum.
See Astronomical object and Photometer
Physical object
In common usage and classical mechanics, a physical object or physical body (or simply an object or body) is a collection of matter within a defined contiguous boundary in three-dimensional space.
See Astronomical object and Physical object
Planck star
In loop quantum gravity theory, a Planck star is a hypothetical astronomical object, theorized as a compact, exotic star, that exists within a black hole's event horizon, created when the energy density of a collapsing star reaches the Planck energy density.
See Astronomical object and Planck star
Planet
A planet is a large, rounded astronomical body that is generally required to be in orbit around a star, stellar remnant, or brown dwarf, and is not one itself.
See Astronomical object and Planet
Planetary nebula
A planetary nebula is a type of emission nebula consisting of an expanding, glowing shell of ionized gas ejected from red giant stars late in their lives.
See Astronomical object and Planetary nebula
Planetary system
A planetary system is a set of gravitationally bound non-stellar objects in or out of orbit around a star or star system.
See Astronomical object and Planetary system
Planetesimal
Planetesimals are solid objects thought to exist in protoplanetary disks and debris disks.
See Astronomical object and Planetesimal
Plasma (physics)
Plasma is one of four fundamental states of matter (the other three being solid, liquid, and gas) characterized by the presence of a significant portion of charged particles in any combination of ions or electrons.
See Astronomical object and Plasma (physics)
Plutino
In astronomy, the plutinos are a dynamical group of trans-Neptunian objects that orbit in 2:3 mean-motion resonance with Neptune.
See Astronomical object and Plutino
Pluto
Pluto (minor-planet designation: 134340 Pluto) is a dwarf planet in the Kuiper belt, a ring of bodies beyond the orbit of Neptune.
See Astronomical object and Pluto
Potentially hazardous object
A potentially hazardous object (PHO) is a near-Earth object – either an asteroid or a comet – with an orbit that can make close approaches to the Earth and which is large enough to cause significant regional damage in the event of impact.
See Astronomical object and Potentially hazardous object
Pre-main-sequence star
A pre-main-sequence star (also known as a PMS star and PMS object) is a star in the stage when it has not yet reached the main sequence.
See Astronomical object and Pre-main-sequence star
Proplyd
A proplyd, short for ionized protoplanetary disk, is an externally illuminated photoevaporating protoplanetary disk around a young star.
See Astronomical object and Proplyd
Protogalaxy
In physical cosmology, a protogalaxy, which could also be called a "primeval galaxy", is a cloud of gas which is forming into a galaxy.
See Astronomical object and Protogalaxy
Protoplanetary disk
A protoplanetary disk is a rotating circumstellar disc of dense gas and dust surrounding a young newly formed star, a T Tauri star, or Herbig Ae/Be star.
See Astronomical object and Protoplanetary disk
Protostar
A protostar is a very young star that is still gathering mass from its parent molecular cloud.
See Astronomical object and Protostar
Pulsar
A pulsar (from pulsating radio source) is a highly magnetized rotating neutron star that emits beams of electromagnetic radiation out of its magnetic poles.
See Astronomical object and Pulsar
Pulsar planet
Pulsar planets are planets that are orbiting pulsars.
See Astronomical object and Pulsar planet
Pulsar wind nebula
A pulsar wind nebula (PWN, plural PWNe), sometimes called a plerion (derived from the Greek "πλήρης", pleres, meaning "full"), is a type of nebula sometimes found inside the shell of a supernova remnant (SNR), powered by winds generated by a central pulsar.
See Astronomical object and Pulsar wind nebula
Quark star
A quark star is a hypothetical type of compact, exotic star, where extremely high core temperature and pressure have forced nuclear particles to form quark matter, a continuous state of matter consisting of free quarks.
See Astronomical object and Quark star
Quasar
A quasar is an extremely luminous active galactic nucleus (AGN).
See Astronomical object and Quasar
Quasi-star
A quasi-star (also called black hole star) is a hypothetical type of extremely massive and luminous star that may have existed early in the history of the Universe.
See Astronomical object and Quasi-star
R Coronae Borealis variable
An R Coronae Borealis variable (abbreviated RCB, R CrB) is an eruptive variable star that varies in luminosity in two modes, one low amplitude pulsation (a few tenths of a magnitude), and one irregular, unpredictably-sudden fading by 1 to 9 magnitudes.
See Astronomical object and R Coronae Borealis variable
Radio galaxy
A radio galaxy is a galaxy with giant regions of radio emission extending well beyond its visible structure.
See Astronomical object and Radio galaxy
Red giant
A red giant is a luminous giant star of low or intermediate mass (roughly 0.3–8 solar masses) in a late phase of stellar evolution.
See Astronomical object and Red giant
Red nugget
Red nuggets is the nickname given to rare, unusually small galaxies packed with large amounts of red stars that were originally observed by Hubble Space Telescope in 2005 in the young universe.
See Astronomical object and Red nugget
Red supergiant
Red supergiants (RSGs) are stars with a supergiant luminosity class (Yerkes class I) and a stellar classification K or M. They are the largest stars in the universe in terms of volume, although they are not the most massive or luminous.
See Astronomical object and Red supergiant
Reflection nebula
In astronomy, reflection nebulae are clouds of interstellar dust which might reflect the light of a nearby star or stars.
See Astronomical object and Reflection nebula
Resonant trans-Neptunian object
In astronomy, a resonant trans-Neptunian object is a trans-Neptunian object (TNO) in mean-motion orbital resonance with Neptune.
See Astronomical object and Resonant trans-Neptunian object
Ring galaxy
A ring galaxy is a galaxy with a circle-like appearance.
See Astronomical object and Ring galaxy
Ring system
A ring system is a disc or torus orbiting an astronomical object that is composed of solid material such as gas, dust, meteoroids, planetoids or moonlets and stellar objects.
See Astronomical object and Ring system
Rogue planet
A rogue planet, also termed a free-floating planet (FFP) or an isolated planetary-mass object (iPMO), is an interstellar object of planetary mass which is not gravitationally bound to any star or brown dwarf.
See Astronomical object and Rogue planet
Rotating ellipsoidal variable
Rotating ellipsoidal variables are a class of close binary variable star systems whose components are ellipsoidal.
See Astronomical object and Rotating ellipsoidal variable
RR Lyrae variable
RR Lyrae variables are periodic variable stars, commonly found in globular clusters.
See Astronomical object and RR Lyrae variable
RV Tauri variable
RV Tauri variables are luminous variable stars that have distinctive light variations with alternating deep and shallow minima.
See Astronomical object and RV Tauri variable
S-type star
An S-type star (or just S star) is a cool giant with approximately equal quantities of carbon and oxygen in its atmosphere.
See Astronomical object and S-type star
S/2015 (136472) 1
S/2015 (136472) 1, unofficially nicknamed MK2 by the discovery team, is the only known moon of the trans-Neptunian dwarf planet Makemake.
See Astronomical object and S/2015 (136472) 1
Satellite galaxy
A satellite galaxy is a smaller companion galaxy that travels on bound orbits within the gravitational potential of a more massive and luminous host galaxy (also known as the primary galaxy).
See Astronomical object and Satellite galaxy
Saturn
Saturn is the sixth planet from the Sun and the second-largest in the Solar System, after Jupiter.
See Astronomical object and Saturn
Scattered disc
The scattered disc (or scattered disk) is a distant circumstellar disc in the Solar System that is sparsely populated by icy small Solar System bodies, which are a subset of the broader family of trans-Neptunian objects.
See Astronomical object and Scattered disc
Scientific Revolution
The Scientific Revolution was a series of events that marked the emergence of modern science during the early modern period, when developments in mathematics, physics, astronomy, biology (including human anatomy) and chemistry transformed the views of society about nature.
See Astronomical object and Scientific Revolution
Sednoid
A sednoid is a trans-Neptunian object with a large semi-major axis and a high perihelion, similar to the orbit of the dwarf planet Sedna.
See Astronomical object and Sednoid
Semiregular variable star
In astronomy, a semiregular variable star, a type of variable star, is a giant or supergiant of intermediate and late (cooler) spectral type showing considerable periodicity in its light changes, accompanied or sometimes interrupted by various irregularities.
See Astronomical object and Semiregular variable star
Seyfert galaxy
Seyfert galaxies are one of the two largest groups of active galaxies, along with quasar host galaxies.
See Astronomical object and Seyfert galaxy
Shell star
A shell star is a star having a spectrum that shows extremely broad absorption lines, plus some very narrow absorption lines.
See Astronomical object and Shell star
Small Solar System body
A small Solar System body (SSSB) is an object in the Solar System that is neither a planet, a dwarf planet, nor a natural satellite.
See Astronomical object and Small Solar System body
Solar System
The Solar SystemCapitalization of the name varies.
See Astronomical object and Solar System
Spectroscopy
Spectroscopy is the field of study that measures and interprets electromagnetic spectra.
See Astronomical object and Spectroscopy
Spheroid
A spheroid, also known as an ellipsoid of revolution or rotational ellipsoid, is a quadric surface obtained by rotating an ellipse about one of its principal axes; in other words, an ellipsoid with two equal semi-diameters.
See Astronomical object and Spheroid
Spiral arm
Spiral arms are a defining feature of spiral galaxies.
See Astronomical object and Spiral arm
Spiral galaxy
Spiral galaxies form a class of galaxy originally described by Edwin Hubble in his 1936 work The Realm of the Nebulae (pp. 124–151) and, as such, form part of the Hubble sequence.
See Astronomical object and Spiral galaxy
Star
A star is a luminous spheroid of plasma held together by self-gravity.
See Astronomical object and Star
Star cluster
Star clusters are large groups of stars held together by self-gravitation.
See Astronomical object and Star cluster
Star system
A star system or stellar system is a small number of stars that orbit each other, bound by gravitational attraction.
See Astronomical object and Star system
Starburst galaxy
A starburst galaxy is one undergoing an exceptionally high rate of star formation, as compared to the long-term average rate of star formation in the galaxy, or the star formation rate observed in most other galaxies.
See Astronomical object and Starburst galaxy
Stellar association
A stellar association is a very loose star cluster, looser than both open clusters and globular clusters.
See Astronomical object and Stellar association
Stellar black hole
A stellar black hole (or stellar-mass black hole) is a black hole formed by the gravitational collapse of a star.
See Astronomical object and Stellar black hole
Stellar classification
In astronomy, stellar classification is the classification of stars based on their spectral characteristics.
See Astronomical object and Stellar classification
Stellar evolution
Stellar evolution is the process by which a star changes over the course of its lifetime and how it can lead to the creation of a new star.
See Astronomical object and Stellar evolution
Stellar kinematics
In astronomy, stellar kinematics is the observational study or measurement of the kinematics or motions of stars through space.
See Astronomical object and Stellar kinematics
Stellar nucleosynthesis
In astrophysics, stellar nucleosynthesis is the creation of chemical elements by nuclear fusion reactions within stars.
See Astronomical object and Stellar nucleosynthesis
Stellar population
In 1944, Walter Baade categorized groups of stars within the Milky Way into stellar populations.
See Astronomical object and Stellar population
Strange star
A strange star, also called a strange quark star, is a hypothetical compact astronomical object, a quark star made of strange quark matter.
See Astronomical object and Strange star
Sub-brown dwarf
A sub-brown dwarf or planetary-mass brown dwarf is an astronomical object that formed in the same manner as stars and brown dwarfs (i.e. through the collapse of a gas cloud) but that has a planetary mass, therefore by definition below the limiting mass for thermonuclear fusion of deuterium (about). Some researchers call them rogue planets whereas others call them planetary-mass brown dwarfs.
See Astronomical object and Sub-brown dwarf
Subdwarf
A subdwarf, sometimes denoted by "sd", is a star with luminosity class VI under the Yerkes spectral classification system.
See Astronomical object and Subdwarf
Subgiant
A subgiant is a star that is brighter than a normal main-sequence star of the same spectral class, but not as bright as giant stars.
See Astronomical object and Subgiant
Subsatellite
A subsatellite, also known as a submoon or a moonmoon, is a "moon of a moon" or a hypothetical natural satellite that orbits the moon of a planet.
See Astronomical object and Subsatellite
Sun
The Sun is the star at the center of the Solar System.
See Astronomical object and Sun
Sunspot
Sunspots are temporary spots on the Sun's surface that are darker than the surrounding area.
See Astronomical object and Sunspot
Super-Earth
A Super-Earth is a type of exoplanet with a mass higher than Earth's, but substantially below those of the Solar System's ice giants, Uranus and Neptune, which are 14.5 and 17 times Earth's, respectively.
See Astronomical object and Super-Earth
Supercluster
A supercluster is a large group of smaller galaxy clusters or galaxy groups; they are among the largest known structures in the universe.
See Astronomical object and Supercluster
Supergiant
Supergiants are among the most massive and most luminous stars.
See Astronomical object and Supergiant
Supermassive black hole
A supermassive black hole (SMBH or sometimes SBH) is the largest type of black hole, with its mass being on the order of hundreds of thousands, or millions to billions, of times the mass of the Sun.
See Astronomical object and Supermassive black hole
Supernova
A supernova (supernovae or supernovas) is a powerful and luminous explosion of a star.
See Astronomical object and Supernova
Supernova remnant
A supernova remnant (SNR) is the structure resulting from the explosion of a star in a supernova.
See Astronomical object and Supernova remnant
Symbiotic binary
A symbiotic binary is a type of binary star system, often simply called a symbiotic star.
See Astronomical object and Symbiotic binary
Synestia
A synestia is a hypothesized rapidly spinning doughnut-shaped mass of vaporized rock.
See Astronomical object and Synestia
T Tauri star
T Tauri stars (TTS) are a class of variable stars that are less than about ten million years old.
See Astronomical object and T Tauri star
Terrestrial planet
A terrestrial planet, telluric planet, or rocky planet, is a planet that is composed primarily of silicate, rocks or metals.
See Astronomical object and Terrestrial planet
Themis family
The Themis family (adj. Themistian) is a family of carbonaceous asteroids located in the outer portion of the asteroid belt, at a mean distance of 3.13 AU from the Sun.
See Astronomical object and Themis family
Thick disk
The thick disk is one of the structural components of about 2/3 of all disk galaxies, including the Milky Way.
See Astronomical object and Thick disk
Thin disk
The thin disk is a structural component of spiral and S0-type galaxies, composed of stars, gas and dust.
See Astronomical object and Thin disk
Thorne–Żytkow object
A Thorne–Żytkow object (TŻO or TZO), also known as a hybrid star, is a conjectured type of star wherein a red giant or red supergiant contains a neutron star at its core, formed from the collision of the giant with the neutron star.
See Astronomical object and Thorne–Żytkow object
Tidal locking
Tidal locking between a pair of co-orbiting astronomical bodies occurs when one of the objects reaches a state where there is no longer any net change in its rotation rate over the course of a complete orbit.
See Astronomical object and Tidal locking
Tidal tail
A tidal tail is a thin, elongated region of stars and interstellar gas that extends into space from a galaxy.
See Astronomical object and Tidal tail
Tidally detached exomoon
Tidally detached exomoons, also known as orphaned exomoons or ploonets, are hypothetical exoplanets that were formerly exomoons of another planet, before being ejected from their orbits around their parent planets by tidal forces during planetary migration, and becoming planets in their own right.
See Astronomical object and Tidally detached exomoon
Toroidal planet
A toroidal planet is a hypothetical type of telluric exoplanet with a toroidal or doughnut shape.
See Astronomical object and Toroidal planet
Trans-Neptunian object
A trans-Neptunian object (TNO), also written transneptunian object, is any minor planet in the Solar System that orbits the Sun at a greater average distance than Neptune, which has an orbital semi-major axis of 30.1 astronomical units (au).
See Astronomical object and Trans-Neptunian object
Trojan (celestial body)
In astronomy, a trojan is a small celestial body (mostly asteroids) that shares the orbit of a larger body, remaining in a stable orbit approximately 60° ahead of or behind the main body near one of its Lagrangian points and.
See Astronomical object and Trojan (celestial body)
Type Ia supernova
A Type Ia supernova (read: "type one-A") is a type of supernova that occurs in binary systems (two stars orbiting one another) in which one of the stars is a white dwarf.
See Astronomical object and Type Ia supernova
Type Ib and Ic supernovae
Type Ib and Type Ic supernovae are categories of supernovae that are caused by the stellar core collapse of massive stars.
See Astronomical object and Type Ib and Ic supernovae
Type II supernova
A Type II supernova or SNII (plural: supernovae) results from the rapid collapse and violent explosion of a massive star.
See Astronomical object and Type II supernova
Ultra-cool dwarf
An ultra-cool dwarf is a stellar or sub-stellar object that has an effective temperature lower than.
See Astronomical object and Ultra-cool dwarf
Ultra-short period planet
An ultra-short period (USP) planet is a type of exoplanet with an orbital period of less than one Earth day.
See Astronomical object and Ultra-short period planet
Universe
The universe is all of space and time and their contents.
See Astronomical object and Universe
University
A university is an institution of higher (or tertiary) education and research which awards academic degrees in several academic disciplines.
See Astronomical object and University
Uranus
Uranus is the seventh planet from the Sun.
See Astronomical object and Uranus
Uranus trojans
A Uranus trojan is an asteroid that shares an orbit with Uranus and the Sun.
See Astronomical object and Uranus trojans
Variable star
A variable star is a star whose brightness as seen from Earth (its apparent magnitude) changes with time.
See Astronomical object and Variable star
Venus
Venus is the second planet from the Sun.
See Astronomical object and Venus
Vesta family
The Vesta family (adj. Vestian) is a family of asteroids.
See Astronomical object and Vesta family
Visual binary
A visual binary is a gravitationally bound binary star system that can be resolved into two stars.
See Astronomical object and Visual binary
Void (astronomy)
Cosmic voids (also known as dark space) are vast spaces between filaments (the largest-scale structures in the universe), which contain very few or no galaxies.
See Astronomical object and Void (astronomy)
Void galaxy
A void galaxy is a galaxy located in a cosmological void.
See Astronomical object and Void galaxy
Vulcanoid
The vulcanoids are a hypothetical population of asteroids that orbit the Sun in a dynamically stable zone inside the orbit of the planet Mercury.
See Astronomical object and Vulcanoid
W Ursae Majoris
W Ursae Majoris (W UMa) is the variable star designation for a binary star system in the northern constellation of Ursa Major.
See Astronomical object and W Ursae Majoris
W Virginis variable
W Virginis variables are a subclass of Type II Cepheids which exhibit pulsation periods between 10–20 days, and are of spectral class F6 – K2.
See Astronomical object and W Virginis variable
Warm–hot intergalactic medium
The warm–hot intergalactic medium (WHIM) is the sparse, warm-to-hot (105 to 107 K) plasma that cosmologists believe to exist in the spaces between galaxies and to contain 40–50% of the baryonic 'normal matter' in the universe at the current epoch.
See Astronomical object and Warm–hot intergalactic medium
Wavelength
In physics and mathematics, wavelength or spatial period of a wave or periodic function is the distance over which the wave's shape repeats.
See Astronomical object and Wavelength
Weakly interacting massive particle
Weakly interacting massive particles (WIMPs) are hypothetical particles that are one of the proposed candidates for dark matter.
See Astronomical object and Weakly interacting massive particle
White dwarf
A white dwarf is a stellar core remnant composed mostly of electron-degenerate matter.
See Astronomical object and White dwarf
William Herschel
Frederick William Herschel (Friedrich Wilhelm Herschel; 15 November 1738 – 25 August 1822) was a German-British astronomer and composer.
See Astronomical object and William Herschel
William Wilson Morgan
William Wilson Morgan (January 3, 1906 – June 21, 1994) was an American astronomer and astrophysicist.
See Astronomical object and William Wilson Morgan
Wolf–Rayet star
Wolf–Rayet stars, often abbreviated as WR stars, are a rare heterogeneous set of stars with unusual spectra showing prominent broad emission lines of ionised helium and highly ionised nitrogen or carbon.
See Astronomical object and Wolf–Rayet star
X-ray binary
X-ray binaries are a class of binary stars that are luminous in X-rays.
See Astronomical object and X-ray binary
X-ray burster
X-ray bursters are one class of X-ray binary stars exhibiting X-ray bursts, periodic and rapid increases in luminosity (typically a factor of 10 or greater) that peak in the X-ray region of the electromagnetic spectrum.
See Astronomical object and X-ray burster
Young stellar object
Young stellar object (YSO) denotes a star in its early stage of evolution.
See Astronomical object and Young stellar object
4 Vesta
Vesta (minor-planet designation: 4 Vesta) is one of the largest objects in the asteroid belt, with a mean diameter of.
See Astronomical object and 4 Vesta
See also
Astronomical objects
- Astronomical X-ray sources
- Astronomical catalogues
- Astronomical nomenclature
- Astronomical object
- Astronomical surveys
- Black holes
- Co-orbital objects
- Comet
- Cosmic dust
- Galaxies
- Galaxy clusters
- Galaxy filaments
- Galaxy superclusters
- High-velocity clouds
- IRAS 13208-6020
- IRAS 20068+4051
- Impact craters
- Lists of astronomical objects
- Nebulae
- Planets
- Poles of astronomical bodies
- RCW 108
- RCW 42
- Star clusters
- Star systems
- Stars
- Substellar objects
References
Also known as Astronomical Objects, Astronomical bodies, Astronomical body, Celestial bodes, Celestial bodies, Celestial body, Celestial object, Celestial objects, Cosmological object, Heavenly body.
, Coma (comet), Comet, Comet nucleus, Comet tail, Compact object, Constellation, Contact binary, Contact binary (small Solar System body), Cosmic dust, Cosmic microwave background, Cosmic string, Cosmology, Culture, Cybele asteroids, Damocloid, Dark galaxy, Dark matter, Dark nebula, Debris disk, Deity, Delta Scuti variable, Detached object, Disc galaxy, Domain wall (string theory), Double star, Dwarf galaxy, Dwarf nova, Dwarf planet, Dysnomia (moon), Earth, Earth analog, Earth trojan, Eccentric Jupiter, Edmond Halley, Edwin Hubble, Ejnar Hertzsprung, Elliptical galaxy, Emission nebula, Eos family, Eris (dwarf planet), Europe, Exocomet, Exomoon, Exoplanet, Exotic star, Eyeball planet, Failed supernova, Flare star, Flora family, Fluid, FU Orionis star, Galactic bulge, Galactic corona, Galactic halo, Galaxy, Galaxy filament, Galaxy groups and clusters, Galaxy merger, Galaxy morphological classification, Galilean moons, Galileo Galilei, Gamma-ray burst, Gas giant, Giant planet, Giant star, Giordano Bruno, Globular cluster, H I region, H II region, Halley's Comet, Haumea, Heliocentrism, Heliosphere, Henry Norris Russell, Hertzsprung–Russell diagram, Hilda asteroid, Hills cloud, Hot Jupiter, Hot Neptune, Hungaria family, Hydrostatic equilibrium, Hygiea family, Hypercompact stellar system, Hypergiant, Hypernova, IAU definition of planet, Ice giant, Instability strip, Interacting galaxy, Intergalactic dust, Intermediate-mass black hole, Interplanetary dust cloud, Interplanetary magnetic field, Interplanetary medium, Interstellar cloud, Interstellar medium, Iron star, Irregular galaxy, Irregular variable, Johannes Kepler, Joseph von Fraunhofer, Jupiter, Jupiter trojan, Kepler's laws of planetary motion, Koronis family, Kuiper belt, Large quasar group, Lenticular galaxy, List of light sources, List of Mars-crossing minor planets, List of natural satellites, List of possible dwarf planets, List of Solar System objects, List of Solar System objects by size, Lists of astronomical objects, Luminous blue variable, Magnetar, Main sequence, Makemake, Maria family, Mars, Mars trojan, Massive compact halo object, Mercury (planet), Meteoroid, Micrometeoroid, Micronova, Microquasar, Middle Ages, Middle East, Milky Way, Minor planet, Minor-planet moon, Mira variable, Molecular cloud, Moon, Moonlet, Moons of Haumea, Moons of Jupiter, Moons of Mars, Moons of Neptune, Moons of Pluto, Moons of Saturn, Moons of Uranus, Natural satellite, Near-Earth object, Nebula, Neptune, Neptune trojan, Neutron star, Nicolaus Copernicus, Nova, Nysa family, Observable universe, Ocean world, Odd radio circle, Oort cloud, Orbital elements, Outer space, OVV quasar, Oxford University Press, P Cygni, Pallas family, Philip Childs Keenan, Phocaea family, Photoelectric effect, Photometer, Physical object, Planck star, Planet, Planetary nebula, Planetary system, Planetesimal, Plasma (physics), Plutino, Pluto, Potentially hazardous object, Pre-main-sequence star, Proplyd, Protogalaxy, Protoplanetary disk, Protostar, Pulsar, Pulsar planet, Pulsar wind nebula, Quark star, Quasar, Quasi-star, R Coronae Borealis variable, Radio galaxy, Red giant, Red nugget, Red supergiant, Reflection nebula, Resonant trans-Neptunian object, Ring galaxy, Ring system, Rogue planet, Rotating ellipsoidal variable, RR Lyrae variable, RV Tauri variable, S-type star, S/2015 (136472) 1, Satellite galaxy, Saturn, Scattered disc, Scientific Revolution, Sednoid, Semiregular variable star, Seyfert galaxy, Shell star, Small Solar System body, Solar System, Spectroscopy, Spheroid, Spiral arm, Spiral galaxy, Star, Star cluster, Star system, Starburst galaxy, Stellar association, Stellar black hole, Stellar classification, Stellar evolution, Stellar kinematics, Stellar nucleosynthesis, Stellar population, Strange star, Sub-brown dwarf, Subdwarf, Subgiant, Subsatellite, Sun, Sunspot, Super-Earth, Supercluster, Supergiant, Supermassive black hole, Supernova, Supernova remnant, Symbiotic binary, Synestia, T Tauri star, Terrestrial planet, Themis family, Thick disk, Thin disk, Thorne–Żytkow object, Tidal locking, Tidal tail, Tidally detached exomoon, Toroidal planet, Trans-Neptunian object, Trojan (celestial body), Type Ia supernova, Type Ib and Ic supernovae, Type II supernova, Ultra-cool dwarf, Ultra-short period planet, Universe, University, Uranus, Uranus trojans, Variable star, Venus, Vesta family, Visual binary, Void (astronomy), Void galaxy, Vulcanoid, W Ursae Majoris, W Virginis variable, Warm–hot intergalactic medium, Wavelength, Weakly interacting massive particle, White dwarf, William Herschel, William Wilson Morgan, Wolf–Rayet star, X-ray binary, X-ray burster, Young stellar object, 4 Vesta.