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162 relations: A-type main-sequence star, Accretion (astrophysics), Accretion disk, Amorphous carbon, Ancient Greek astronomy, Archimedes, Aristarchus of Samos, Aryabhata, Aryabhatiya, Asteroid, Asteroid belt, Astrobiology, Astronomy & Astrophysics, Asymptotic giant branch, BD +17° 3248, Beta Pictoris, Black hole, Brown dwarf, Bulge (astronomy), California Institute of Technology, Centaurus, Circumstellar disc, Circumstellar habitable zone, Co-orbital configuration, Comet, Coronagraph, David Ciardi, De revolutionibus orbium coelestium, Doppler spectroscopy, Double planet, Dwarf planet, Earth, Elliptic orbit, Elliptical galaxy, Epsilon Eridani, Exomoon, Exoplanet, F-type main-sequence star, Fomalhaut, G-type main-sequence star, Galactic Center, Galactic Disc, Galactic tide, Galaxy cluster, Galaxy morphological classification, Galileo Galilei, Gas giant, General Scholium, Geocentric model, Giordano Bruno, ..., Globular cluster, Gravitational microlensing, Gravity, Hale Telescope, HD 172555, HD 256, Heliocentrism, Helium, History of India, Hot Jupiter, Hydrogen, Interplanetary dust cloud, Isaac Newton, Johannes Kepler, Jupiter, K-type main-sequence star, Kapteyn b, Kapteyn's Star, Kepler (spacecraft), Kepler's laws of planetary motion, Kepler-223, Kepler-66, Kepler-67, Kuiper belt, Light-year, List of exoplanetary host stars, List of exoplanets, List of multiplanetary systems, Lithium, Logarithmic scale, Main sequence, Metal, Metallicity, Meteoroid, Methods of detecting exoplanets, Milky Way, Molecular cloud, Natural satellite, Nature (journal), Neptune, Neutron star, NGC 2547, NGC 6811, Nicolaus Copernicus, Nodal precession, Oort cloud, Open cluster, Orbit, Orbital eccentricity, Orbital plane (astronomy), Orbital resonance, OTS 44, Philosophiæ Naturalis Principia Mathematica, Photoevaporation, Physics, Planet, Planetary core, Planetary migration, Planetary nebula, Planetesimal, Proceedings of the National Academy of Sciences of the United States of America, Progress of Theoretical and Experimental Physics, Protoplanet, Protoplanetary disk, PSR B1257+12, Publications of the Astronomical Society of the Pacific, Pulsar, Pulsar kick, Red dwarf, Red giant, Relative velocity, Rogue planet, Roman Inquisition, Runaway greenhouse effect, Scattered disc, Search for extraterrestrial intelligence, Shawn Domagal-Goldman, Silicate, Sky & Telescope, Sneden's Star, Solar System, Spiral galaxy, Spitzer Space Telescope, Star, Star formation, Star system, Stars and planetary systems in fiction, Stellar classification, Sub-brown dwarf, Sun, Super-Earth, Supernova, Tau Ceti, Terrestrial planet, The Sand Reckoner, Universe, Upsilon Andromedae, Vedas, Vega, Venus, WASP-12b, Western philosophy, Wide Field Infrared Survey Telescope, Zodiacal light, 16 Cygni, 1SWASP J140747.93-394542.6, 2 Andromedae, 49 Ceti, 5 Vulpeculae, 51 Ophiuchi, 51 Pegasi, 51 Pegasi b. Expand index (112 more) »
A-type main-sequence star
An A-type main-sequence star (A V) or A dwarf star is a main-sequence (hydrogen-burning) star of spectral type A and luminosity class V. These stars have spectra which are defined by strong hydrogen Balmer absorption lines.
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Accretion (astrophysics)
In astrophysics, accretion is the accumulation of particles into a massive object by gravitationally attracting more matter, typically gaseous matter, in an accretion disk.
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Accretion disk
An accretion disk is a structure (often a circumstellar disk) formed by diffused material in orbital motion around a massive central body.
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Amorphous carbon
Amorphous carbon is free, reactive carbon that does not have any crystalline structure (also called diamond-like carbon).
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Ancient Greek astronomy
Greek astronomy is astronomy written in the Greek language in classical antiquity.
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Archimedes
Archimedes of Syracuse (Ἀρχιμήδης) was a Greek mathematician, physicist, engineer, inventor, and astronomer.
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Aristarchus of Samos
Aristarchus of Samos (Ἀρίσταρχος ὁ Σάμιος, Aristarkhos ho Samios; c. 310 – c. 230 BC) was an ancient Greek astronomer and mathematician who presented the first known model that placed the Sun at the center of the known universe with the Earth revolving around it (see Solar system).
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Aryabhata
Aryabhata (IAST) or Aryabhata I (476–550 CE) was the first of the major mathematician-astronomers from the classical age of Indian mathematics and Indian astronomy.
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Aryabhatiya
Aryabhatiya (IAST) or Aryabhatiyam, a Sanskrit astronomical treatise, is the magnum opus and only known surviving work of the 5th century Indian mathematician Aryabhata.
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Asteroid
Asteroids are minor planets, especially those of the inner Solar System.
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Asteroid belt
The asteroid belt is the circumstellar disc in the Solar System located roughly between the orbits of the planets Mars and Jupiter.
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Astrobiology
Astrobiology is a branch of biology concerned with the origins, early evolution, distribution, and future of life in the universe.
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Astronomy & Astrophysics
Astronomy & Astrophysics is a peer-reviewed scientific journal covering theoretical, observational, and instrumental astronomy and astrophysics.
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Asymptotic giant branch
The asymptotic giant branch (AGB) is a region of the Hertzsprung–Russell diagram populated by evolved cool luminous stars.
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BD +17° 3248
BD +17° 3248 is an old Population II star located at a distance of roughly in the Galactic Halo.
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Beta Pictoris
Beta Pictoris (β Pic, β Pictoris) is the second brightest star in the constellation Pictor.
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Black hole
A black hole is a region of spacetime exhibiting such strong gravitational effects that nothing—not even particles and electromagnetic radiation such as light—can escape from inside it.
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Brown dwarf
Brown dwarfs are substellar objects that occupy the mass range between the heaviest gas giant planets and the lightest stars, having masses between approximately 13 to 75–80 times that of Jupiter, or approximately to about.
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Bulge (astronomy)
In astronomy, a bulge is a tightly packed group of stars within a larger formation.
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California Institute of Technology
The California Institute of Technology (abbreviated Caltech)The university itself only spells its short form as "Caltech"; other spellings such as.
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Centaurus
Centaurus is a bright constellation in the southern sky.
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Circumstellar disc
A circumstellar disc (or circumstellar disk) is a torus, pancake or ring-shaped accumulation of matter composed of gas, dust, planetesimals, asteroids or collision fragments in orbit around a star.
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Circumstellar habitable zone
In astronomy and astrobiology, the circumstellar habitable zone (CHZ), or simply the habitable zone, is the range of orbits around a star within which a planetary surface can support liquid water given sufficient atmospheric pressure.
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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.
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Comet
A comet is an icy small Solar System body that, when passing close to the Sun, warms and begins to release gases, a process called outgassing.
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Coronagraph
A coronagraph is a telescopic attachment designed to block out the direct light from a star so that nearby objects – which otherwise would be hidden in the star's bright glare – can be resolved.
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David Ciardi
David Robert Ciardi (born 17 July 1969) is an American astronomer.
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De revolutionibus orbium coelestium
De revolutionibus orbium coelestium (On the Revolutions of the Heavenly Spheres) is the seminal work on the heliocentric theory of the Renaissance astronomer Nicolaus Copernicus (1473–1543).
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Doppler spectroscopy
Doppler spectroscopy (also known as the radial-velocity method, or colloquially, the wobble method) is an indirect method for finding extrasolar planets and brown dwarfs from radial-velocity measurements via observation of Doppler shifts in the spectrum of the planet's parent star.
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Double planet
In astronomy, a double planet (also binary planet) is a binary system where both objects are of planetary mass.
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Dwarf planet
A dwarf planet is a planetary-mass object that is neither a planet nor a natural satellite.
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Earth
Earth is the third planet from the Sun and the only astronomical object known to harbor life.
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Elliptic orbit
In astrodynamics or celestial mechanics, an elliptic orbit or elliptical orbit is a Kepler orbit with an eccentricity of less than 1; this includes the special case of a circular orbit, with eccentricity equal to 0.
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Elliptical galaxy
An elliptical galaxy is a type of galaxy having an approximately ellipsoidal shape and a smooth, nearly featureless image.
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Epsilon Eridani
Epsilon Eridani (ε Eridani, abbreviated Epsilon Eri, ε Eri), also named Ran, is a star in the southern constellation of Eridanus, at a declination of 9.46° south of the celestial equator.
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Exomoon
An exomoon or extrasolar moon is a natural satellite that orbits an exoplanet or other non-stellar extrasolar body.
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Exoplanet
An exoplanet or extrasolar planet is a planet outside our solar system.
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F-type main-sequence star
An F-type main-sequence star (F V) is a main-sequence, hydrogen-fusing star of spectral type F and luminosity class V. These stars have from 1.0 to 1.4 times the mass of the Sun and surface temperatures between 6,000 and 7,600 K.Tables VII and VIII.
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Fomalhaut
Fomalhaut, also designated Alpha Piscis Austrini (α Piscis Austrini, abbreviated Alpha PsA, α PsA) is the brightest star in the constellation of Piscis Austrinus and one of the brightest stars in the sky.
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G-type main-sequence star
A G-type main-sequence star (Spectral type: G-V), often (and imprecisely) called a yellow dwarf, or G dwarf star, is a main-sequence star (luminosity class V) of spectral type G. Such a star has about 0.84 to 1.15 solar masses and surface temperature of between 5,300 and 6,000 K., G. M. H. J. Habets and J. R. W. Heintze, Astronomy and Astrophysics Supplement 46 (November 1981), pp.
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Galactic Center
The Galactic Center is the rotational center of the Milky Way.
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Galactic Disc
The Galactic Disc is a component of disc galaxies, such as spiral galaxies and lenticular galaxies.
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Galactic tide
A galactic tide is a tidal force experienced by objects subject to the gravitational field of a galaxy such as the Milky Way.
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Galaxy cluster
A galaxy cluster, or cluster of galaxies, is a structure that consists of anywhere from hundreds to thousands of galaxies that are bound together by gravity with typical masses ranging from 1014–1015 solar masses.
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Galaxy morphological classification
Galaxy morphological classification is a system used by astronomers to divide galaxies into groups based on their visual appearance.
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Galileo Galilei
Galileo Galilei (15 February 1564Drake (1978, p. 1). The date of Galileo's birth is given according to the Julian calendar, which was then in force throughout Christendom. In 1582 it was replaced in Italy and several other Catholic countries with the Gregorian calendar. Unless otherwise indicated, dates in this article are given according to the Gregorian calendar. – 8 January 1642) was an Italian polymath.
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Gas giant
A gas giant is a giant planet composed mainly of hydrogen and helium.
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General Scholium
The General Scholium is an essay written by Isaac Newton, appended to his work of Philosophiæ Naturalis Principia Mathematica, known as the Principia.
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Geocentric model
In astronomy, the geocentric model (also known as geocentrism, or the Ptolemaic system) is a superseded description of the universe with Earth at the center.
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Giordano Bruno
Giordano Bruno (Iordanus Brunus Nolanus; 1548 – 17 February 1600), born Filippo Bruno, was an Italian Dominican friar, philosopher, mathematician, poet, and cosmological theorist.
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Globular cluster
A globular cluster is a spherical collection of stars that orbits a galactic core as a satellite.
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Gravitational microlensing
Gravitational microlensing is an astronomical phenomenon due to the gravitational lens effect.
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Gravity
Gravity, or gravitation, is a natural phenomenon by which all things with mass or energy—including planets, stars, galaxies, and even light—are brought toward (or gravitate toward) one another.
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Hale Telescope
The Hale telescope is a, f/3.3 reflecting telescope at the Palomar Observatory in California, US, named after astronomer George Ellery Hale.
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HD 172555
HD 172555 is a white-hot A7V star located relatively close by, 95 light years from Earth in the direction of the constellation Pavo.
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HD 256
HD 256 is a young A-type star in the constellation Cetus.
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Heliocentrism
Heliocentrism is the astronomical model in which the Earth and planets revolve around the Sun at the center of the Solar System.
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Helium
Helium (from lit) is a chemical element with symbol He and atomic number 2.
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History of India
The history of India includes the prehistoric settlements and societies in the Indian subcontinent; the advancement of civilisation from the Indus Valley Civilisation to the eventual blending of the Indo-Aryan culture to form the Vedic Civilisation; the rise of Hinduism, Jainism and Buddhism;Sanderson, Alexis (2009), "The Śaiva Age: The Rise and Dominance of Śaivism during the Early Medieval Period." In: Genesis and Development of Tantrism, edited by Shingo Einoo, Tokyo: Institute of Oriental Culture, University of Tokyo, 2009.
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Hot Jupiter
Hot Jupiters are a class of gas giant exoplanets that are inferred to be physically similar to Jupiter but that have very short orbital period (P The close proximity to their stars and high surface-atmosphere temperatures resulted in the moniker "hot Jupiters". Hot Jupiters are the easiest extrasolar planets to detect via the radial-velocity method, because the oscillations they induce in their parent stars' motion are relatively large and rapid compared to those of other known types of planets. One of the best-known hot Jupiters is 51 Pegasi b. Discovered in 1995, it was the first extrasolar planet found orbiting a Sun-like star. 51 Pegasi b has an orbital period of about 4 days.
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Hydrogen
Hydrogen is a chemical element with symbol H and atomic number 1.
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Interplanetary dust cloud
The interplanetary dust cloud, or zodiacal cloud, consists of cosmic dust (small particles floating in outer space) that pervades the space between planets in the Solar System and other planetary systems.
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Isaac Newton
Sir Isaac Newton (25 December 1642 – 20 March 1726/27) was an English mathematician, astronomer, theologian, author and physicist (described in his own day as a "natural philosopher") who is widely recognised as one of the most influential scientists of all time, and a key figure in the scientific revolution.
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Johannes Kepler
Johannes Kepler (December 27, 1571 – November 15, 1630) was a German mathematician, astronomer, and astrologer.
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Jupiter
Jupiter is the fifth planet from the Sun and the largest in the Solar System.
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K-type main-sequence star
A K-type main-sequence star (K V), also referred to as an orange dwarf or K dwarf, is a main-sequence (hydrogen-burning) star of spectral type K and luminosity class V. These stars are intermediate in size between red M-type main-sequence stars ("red dwarfs") and yellow G-type main-sequence stars.
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Kapteyn b
Kapteyn b is a possible exoplanet that orbits within the habitable zone of the red subdwarf Kapteyn's star, located approximately from Earth.
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Kapteyn's Star
Kapteyn's Star is a class M1 red subdwarf about 12.76 light years from Earth in the southern constellation Pictor; it is the closest halo star to the Solar System.
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Kepler (spacecraft)
Kepler is a space observatory launched by NASA to discover Earth-size planets orbiting other stars.
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Kepler's laws of planetary motion
In astronomy, Kepler's laws of planetary motion are three scientific laws describing the motion of planets around the Sun.
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Kepler-223
Kepler-223 (KOI-730, KIC #10227020) is a G5V star with an extrasolar planetary system discovered by the Kepler mission.
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Kepler-66
Kepler-66 is a star with slightly more mass than the Sun in the NGC 6811 open cluster in the Cygnus constellation.
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Kepler-67
Kepler-67 is a star with slightly less mass than the Sun in the NGC 6811 open cluster in the Cygnus constellation and has one confirmed planet, slightly smaller than Neptune, announced in 2013.
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Kuiper belt
The Kuiper belt, occasionally called the Edgeworth–Kuiper belt, is a circumstellar disc in the outer Solar System, extending from the orbit of Neptune (at 30 AU) to approximately 50 AU from the Sun.
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Light-year
The light-year is a unit of length used to express astronomical distances and measures about 9.5 trillion kilometres or 5.9 trillion miles.
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List of exoplanetary host stars
The following is a list of exoplanetary host stars.
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List of exoplanets
This is a list of exoplanets.
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List of multiplanetary systems
From the total of stars known to have exoplanets (as of), there are a total of known multiplanetary systems, or stars with at least two confirmed planets, beyond the Solar System.
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Lithium
Lithium (from lit) is a chemical element with symbol Li and atomic number 3.
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Logarithmic scale
A logarithmic scale is a nonlinear scale used when there is a large range of quantities.
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Main sequence
In astronomy, the main sequence is a continuous and distinctive band of stars that appear on plots of stellar color versus brightness.
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Metal
A metal (from Greek μέταλλον métallon, "mine, quarry, metal") is a material (an element, compound, or alloy) that is typically hard when in solid state, opaque, shiny, and has good electrical and thermal conductivity.
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Metallicity
In astronomy, metallicity is used to describe the abundance of elements present in an object that are heavier than hydrogen or helium.
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Meteoroid
A meteoroid is a small rocky or metallic body in outer space.
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Methods of detecting exoplanets
Any planet is an extremely faint light source compared to its parent star.
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Milky Way
The Milky Way is the galaxy that contains our Solar System.
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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 the formation of molecules, most commonly molecular hydrogen (H2).
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Natural satellite
A natural satellite or moon is, in the most common usage, an astronomical body that orbits a planet or minor planet (or sometimes another small Solar System body).
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Nature (journal)
Nature is a British multidisciplinary scientific journal, first published on 4 November 1869.
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Neptune
Neptune is the eighth and farthest known planet from the Sun in the Solar System.
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Neutron star
A neutron star is the collapsed core of a large star which before collapse had a total of between 10 and 29 solar masses.
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NGC 2547
NGC 2547 is a southern open cluster in Vela, discovered by Nicolas Louis de Lacaille in 1751 from South Africa.
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NGC 6811
NGC 6811 is an open cluster in the constellation of Cygnus, near the constellation of Lyra.
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Nicolaus Copernicus
Nicolaus Copernicus (Mikołaj Kopernik; Nikolaus Kopernikus; Niklas Koppernigk; 19 February 1473 – 24 May 1543) was a Renaissance-era mathematician and astronomer who formulated a model of the universe that placed the Sun rather than the Earth at the center of the universe, likely independently of Aristarchus of Samos, who had formulated such a model some eighteen centuries earlier.
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Nodal precession
Nodal precession is the precession of the orbital plane of a satellite around the rotation axis of an astronomical body such as Earth.
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Oort cloud
The Oort cloud, named after the Dutch astronomer Jan Oort, sometimes called the Öpik–Oort cloud, is a theoretical cloud of predominantly icy planetesimals proposed to surround the Sun at distances ranging from.
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Open cluster
An open cluster is a group of up to a few thousand stars that were formed from the same giant molecular cloud and have roughly the same age.
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Orbit
In physics, an orbit is the gravitationally curved trajectory of an object, such as the trajectory of a planet around a star or a natural satellite around a planet.
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Orbital eccentricity
The orbital eccentricity of an astronomical object is a parameter that determines the amount by which its orbit around another body deviates from a perfect circle.
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Orbital plane (astronomy)
The orbital plane of a revolving body is the geometric plane on which its orbit lies.
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Orbital resonance
In celestial mechanics, an orbital resonance occurs when orbiting bodies exert a regular, periodic gravitational influence on each other, usually because their orbital periods are related by a ratio of small integers.
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OTS 44
OTS 44 is a free-floating planetary-mass object or brown dwarf located at in the constellation Chamaeleon.
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Philosophiæ Naturalis Principia Mathematica
Philosophiæ Naturalis Principia Mathematica (Latin for Mathematical Principles of Natural Philosophy), often referred to as simply the Principia, is a work in three books by Isaac Newton, in Latin, first published 5 July 1687.
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Photoevaporation
Photoevaporation denotes the process where energetic radiation ionises gas and causes it to disperse away from the ionising source.
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Physics
Physics (from knowledge of nature, from φύσις phýsis "nature") is the natural science that studies matterAt the start of The Feynman Lectures on Physics, Richard Feynman offers the atomic hypothesis as the single most prolific scientific concept: "If, in some cataclysm, all scientific knowledge were to be destroyed one sentence what statement would contain the most information in the fewest words? I believe it is that all things are made up of atoms – little particles that move around in perpetual motion, attracting each other when they are a little distance apart, but repelling upon being squeezed into one another..." and its motion and behavior through space and time and that studies the related entities of energy and force."Physical science is that department of knowledge which relates to the order of nature, or, in other words, to the regular succession of events." Physics is one of the most fundamental scientific disciplines, and its main goal is to understand how the universe behaves."Physics is one of the most fundamental of the sciences. Scientists of all disciplines use the ideas of physics, including chemists who study the structure of molecules, paleontologists who try to reconstruct how dinosaurs walked, and climatologists who study how human activities affect the atmosphere and oceans. Physics is also the foundation of all engineering and technology. No engineer could design a flat-screen TV, an interplanetary spacecraft, or even a better mousetrap without first understanding the basic laws of physics. (...) You will come to see physics as a towering achievement of the human intellect in its quest to understand our world and ourselves."Physics is an experimental science. Physicists observe the phenomena of nature and try to find patterns that relate these phenomena.""Physics is the study of your world and the world and universe around you." Physics is one of the oldest academic disciplines and, through its inclusion of astronomy, perhaps the oldest. Over the last two millennia, physics, chemistry, biology, and certain branches of mathematics were a part of natural philosophy, but during the scientific revolution in the 17th century, these natural sciences emerged as unique research endeavors in their own right. Physics intersects with many interdisciplinary areas of research, such as biophysics and quantum chemistry, and the boundaries of physics are not rigidly defined. New ideas in physics often explain the fundamental mechanisms studied by other sciences and suggest new avenues of research in academic disciplines such as mathematics and philosophy. Advances in physics often enable advances in new technologies. For example, advances in the understanding of electromagnetism and nuclear physics led directly to the development of new products that have dramatically transformed modern-day society, such as television, computers, domestic appliances, and nuclear weapons; advances in thermodynamics led to the development of industrialization; and advances in mechanics inspired the development of calculus.
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Planet
A planet is an astronomical body orbiting a star or stellar remnant that is massive enough to be rounded by its own gravity, is not massive enough to cause thermonuclear fusion, and has cleared its neighbouring region of planetesimals.
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Planetary core
The planetary core consists of the innermost layer(s) of a planet; which may be composed of solid and liquid layers.
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Planetary migration
Planetary migration occurs when a planet or other stellar satellite interacts with a disk of gas or planetesimals, resulting in the alteration of the satellite's orbital parameters, especially its semi-major axis.
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Planetary nebula
A planetary nebula, abbreviated as PN or plural PNe, is a type of emission nebula consisting of an expanding, glowing shell of ionized gas ejected from red giant stars late in their lives.
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Planetesimal
Planetesimals are solid objects thought to exist in protoplanetary disks and in debris disks.
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Proceedings of the National Academy of Sciences of the United States of America
Proceedings of the National Academy of Sciences of the United States of America (PNAS) is the official scientific journal of the National Academy of Sciences, published since 1915.
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Progress of Theoretical and Experimental Physics
Progress of Theoretical and Experimental Physics is a monthly peer-reviewed scientific journal published by Oxford University Press on behalf of the Physical Society of Japan.
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Protoplanet
A protoplanet is a large planetary embryo that originated within a protoplanetary disc and has undergone internal melting to produce a differentiated interior.
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Protoplanetary disk
A protoplanetary disk is a rotating circumstellar disk of dense gas and dust surrounding a young newly formed star, a T Tauri star, or Herbig Ae/Be star.
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PSR B1257+12
PSR B1257+12, previously designated PSR 1257+12, alternatively designated PSR J1300+1240, also named Lich, is a pulsar located 2,300 light years from the Sun in the constellation of Virgo.
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Publications of the Astronomical Society of the Pacific
Publications of the Astronomical Society of the Pacific (often abbreviated as PASP in references and literature) is a monthly peer-reviewed scientific journal managed by the Astronomical Society of the Pacific.
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Pulsar
A pulsar (from pulse and -ar as in quasar) is a highly magnetized rotating neutron star or white dwarf that emits a beam of electromagnetic radiation.
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Pulsar kick
A pulsar kick is the phenomenon that a neutron star often does not move with the velocity of its progenitor star, but rather with a substantially greater speed.
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Red dwarf
A red dwarf (or M dwarf) is a small and relatively cool star on the main sequence, of M spectral type.
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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.
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Relative velocity
The relative velocity \vec_ (also \vec_ or \vec_) is the velocity of an object or observer B in the rest frame of another object or observer A.
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Rogue planet
A rogue planet (also termed an interstellar planet, nomad planet, free-floating planet, orphan planet, wandering planet, starless planet, or sunless planet) is a planetary-mass object that orbits a galactic center directly.
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Roman Inquisition
The Roman Inquisition, formally the Supreme Sacred Congregation of the Roman and Universal Inquisition, was a system of tribunals developed by the Holy See of the Roman Catholic Church, during the second half of the 16th century, responsible for prosecuting individuals accused of a wide array of crimes relating to religious doctrine or alternate religious doctrine or alternate religious beliefs.
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Runaway greenhouse effect
A runaway greenhouse effect is a process in which a net positive feedback between surface temperature and atmospheric opacity increases the strength of the greenhouse effect on a planet until its oceans boil away.
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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, and are a subset of the broader family of trans-Neptunian objects.
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Search for extraterrestrial intelligence
The search for extraterrestrial intelligence (SETI) is a collective term for scientific searches for intelligent extraterrestrial life, for example, monitoring electromagnetic radiation for signs of transmissions from civilizations on other planets.
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Shawn Domagal-Goldman
Shawn D. Domagal-Goldman is a research space scientist at NASA Goddard Space Flight Center, who specializes in exoplanets, Archean geochemistry, planetary atmospheres, and astrobiology.
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Silicate
In chemistry, a silicate is any member of a family of anions consisting of silicon and oxygen, usually with the general formula, where 0 ≤ x Silicate anions are often large polymeric molecules with an extense variety of structures, including chains and rings (as in polymeric metasilicate), double chains (as in, and sheets (as in. In geology and astronomy, the term silicate is used to mean silicate minerals, ionic solids with silicate anions; as well as rock types that consist predominantly of such minerals. In that context, the term also includes the non-ionic compound silicon dioxide (silica, quartz), which would correspond to x.
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Sky & Telescope
Sky & Telescope (S&T) is a monthly American magazine covering all aspects of amateur astronomy, including the following.
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Sneden's Star
BPS CS22892-0052 (Sneden's Star) is an old population II star located at a distance of 4.7 kpc in the galactic halo.
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Solar System
The Solar SystemCapitalization of the name varies.
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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.
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Spitzer Space Telescope
The Spitzer Space Telescope (SST), formerly the Space Infrared Telescope Facility (SIRTF), is an infrared space telescope launched in 2003 and still operating as of 2018.
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Star
A star is type of astronomical object consisting of a luminous spheroid of plasma held together by its own gravity.
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Star formation
Star formation is the process by which dense regions within molecular clouds in interstellar space, sometimes referred to as "stellar nurseries" or "star-forming regions", collapse and form stars.
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Star system
A star system or stellar system is a small number of stars that orbit each other, bound by gravitational attraction.
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Stars and planetary systems in fiction
The planetary systems of stars other than the Sun and the Solar System are a staple element in many works of the science fiction genre.
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Stellar classification
In astronomy, stellar classification is the classification of stars based on their spectral characteristics.
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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 mass below the limiting mass for thermonuclear fusion of deuterium (about). Some researchers call them free-floating planets whereas others call them planetary-mass brown dwarfs.
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Sun
The Sun is the star at the center of the Solar System.
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Super-Earth
A super-Earth is an extrasolar planet with a mass higher than Earth's, but substantially below the masses of the Solar System's ice giants, Uranus and Neptune, which have masses of 15 and 17 times Earth's, respectively.
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Supernova
A supernova (plural: supernovae or supernovas, abbreviations: SN and SNe) is a transient astronomical event that occurs during the last stellar evolutionary stages of a star's life, either a massive star or a white dwarf, whose destruction is marked by one final, titanic explosion.
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Tau Ceti
Tau Ceti, Latinized from τ Ceti, is a single star in the constellation Cetus that is spectrally similar to the Sun, although it has only about 78% of the Sun's mass.
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Terrestrial planet
A terrestrial planet, telluric planet, or rocky planet is a planet that is composed primarily of silicate rocks or metals.
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The Sand Reckoner
The Sand Reckoner (Ψαμμίτης, Psammites) is a work by Archimedes in which he set out to determine an upper bound for the number of grains of sand that fit into the universe.
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Universe
The Universe is all of space and time and their contents, including planets, stars, galaxies, and all other forms of matter and energy.
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Upsilon Andromedae
Upsilon Andromedae (υ Andromedae, abbreviated Upsilon And, υ And) is a binary star located approximately 44 light-years from Earth in the constellation of Andromeda.
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Vedas
The Vedas are ancient Sanskrit texts of Hinduism. Above: A page from the ''Atharvaveda''. The Vedas (Sanskrit: वेद, "knowledge") are a large body of knowledge texts originating in the ancient Indian subcontinent.
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Vega
Vega, also designated Alpha Lyrae (α Lyrae, abbreviated Alpha Lyr or α Lyr), is the brightest star in the constellation of Lyra, the fifth-brightest star in the night sky, and the second-brightest star in the northern celestial hemisphere, after Arcturus.
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Venus
Venus is the second planet from the Sun, orbiting it every 224.7 Earth days.
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WASP-12b
WASP-12b is an extrasolar planet orbiting the star WASP-12, discovered by the SuperWASP planetary transit survey.
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Western philosophy
Western philosophy is the philosophical thought and work of the Western world.
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Wide Field Infrared Survey Telescope
The Wide Field Infrared Survey Telescope (WFIRST) is a NASA infrared space observatory that was recommended in 2010 by United States National Research Council Decadal Survey committee as the top priority for the next decade of astronomy.
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Zodiacal light
Zodiacal light (also called false dawn when seen before sunrise) is a faint, diffuse, and roughly triangular white glow that is visible in the night sky and appears to extend from the Sun's direction and along the zodiac, straddling the ecliptic.
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16 Cygni
16 Cygni or 16 Cyg is the Flamsteed designation of a triple star system approximately 69 light-years away from Earth in the constellation of Cygnus.
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1SWASP J140747.93-394542.6
1SWASP J140747.93-394542.6 (often abbreviated 1SWASP J140747 or J1407) is a star similar to the Sun in the constellation Centaurus at a distance of about 420 light years from Earth.
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2 Andromedae
2 Andromedae (abbreviated 2 And) is a binary star in the constellation Andromeda.
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49 Ceti
49 Ceti is a star in the constellation of Cetus.
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5 Vulpeculae
5 Vulpeculae is a single, white-hued star in the northern constellation of Vulpecula.
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51 Ophiuchi
51 Ophiuchi (51 Oph) is a star located approximately 410 light years away in the constellation Ophiuchus, northwest of the center of the Milky Way.
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51 Pegasi
51 Pegasi (abbreviated 51 Peg), also named Helvetios, is a Sun-like star located from Earth in the constellation of Pegasus.
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51 Pegasi b
51 Pegasi b (abbreviated 51 Peg b), unofficially dubbed Bellerophon, later named Dimidium, is an extrasolar planet approximately 50 light-years away in the constellation of Pegasus.
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Redirects here:
Double planet system, Double-planet system, Exoplanet host stars, Exoplanet, page 2, Exoplanetary system, Extrasolar system, Planetary systems, Solar systems, Stars with multiple planets, Venus zone.
References
[1] https://en.wikipedia.org/wiki/Planetary_system
