Logo
Unionpedia
Communication
Get it on Google Play
New! Download Unionpedia on your Android™ device!
Install
Faster access than browser!
 

Cosmic distance ladder

Index Cosmic distance ladder

The cosmic distance ladder (also known as the extragalactic distance scale) is the succession of methods by which astronomers determine the distances to celestial objects. [1]

131 relations: Absolute magnitude, Accuracy and precision, Alex Filippenko, Andromeda Galaxy, Apparent magnitude, Asteroid, Astrometry, Astronomical spectroscopy, Astronomical unit, Astronomy, Astronomy & Astrophysics, Baryon acoustic oscillations, Binary star, Black hole, Bolometer, Calibration, Centre for Astrophysics and Supercomputing, Cepheid variable, Chandrasekhar limit, Charge-coupled device, Chirp mass, Dark energy, Distance, Distance measures (cosmology), Distance modulus, Doppler effect, Dynamical parallax, Earth, Eddington luminosity, Edwin Hubble, Elliptical galaxy, Error, Extinction (astronomy), Faber–Jackson relation, Fraunhofer lines, Friedmann equations, Gaia (spacecraft), Galaxy cluster, Globular cluster, Gravitational lens, Gravitational wave, Hertzsprung–Russell diagram, Hipparcos, Hubble's law, Hyades (star cluster), Interferometry, Inverse-square law, Jay Pasachoff, Kepler's laws of planetary motion, Kilonova, ..., Large Magellanic Cloud, Light curve, Light echo, Light-year, LIGO Scientific Collaboration, Luminosity, Main sequence, Metallicity, Milky Way, Minute and second of arc, Monthly Notices of the Royal Astronomical Society, NASA, Nature (journal), Nebula, Neutron star, Nova, Olin Chaddock Wilson, Open cluster, Orbital decay, Parallax, Parsec, Photosphere, Physical cosmology, Planetary nebula, Planetary nebula luminosity function, Propagation of uncertainty, Proper motion, Proportionality (mathematics), Publications of the Astronomical Society of the Pacific, Quasar, Radar, Radial velocity, Ratio, Redshift, René Racine, RR Lyrae variable, Sigma-D relation, Small Magellanic Cloud, SN 2003fg, Solar System, Spacecraft, Spectroscopic parallax, Spiral galaxy, Square root, Standard ruler, Star, Star cluster, Star formation, Statistics, Stellar classification, Stellar evolution, Stellar parallax, Stellar population, Sun, Supernova, Supernova remnant, Surface brightness, Surface brightness fluctuation, The Astronomical Journal, The Astrophysical Journal, Tip of the red-giant branch, Triangle, Triangulum Galaxy, Tully–Fisher relation, Type Ia supernova, Universe, Vainu Bappu, Variable star, Velocity, Velocity dispersion, Venus, Virgo Cluster, Virgo interferometer, Visual binary, Void (astronomy), Walter Baade, Wide Field Camera 3, WiggleZ Dark Energy Survey, Wilson–Bappu effect, X-ray binary, X-ray burster. Expand index (81 more) »

Absolute magnitude

Absolute magnitude is a measure of the luminosity of a celestial object, on a logarithmic astronomical magnitude scale.

New!!: Cosmic distance ladder and Absolute magnitude · See more »

Accuracy and precision

Precision is a description of random errors, a measure of statistical variability.

New!!: Cosmic distance ladder and Accuracy and precision · See more »

Alex Filippenko

Alexei Vladimir "Alex" Filippenko (born July 25, 1958) is an American astrophysicist and professor of astronomy at the University of California, Berkeley.

New!!: Cosmic distance ladder and Alex Filippenko · See more »

Andromeda Galaxy

The Andromeda Galaxy, also known as Messier 31, M31, or NGC 224, is a spiral galaxy approximately 780 kiloparsecs (2.5 million light-years) from Earth, and the nearest major galaxy to the Milky Way.

New!!: Cosmic distance ladder and Andromeda Galaxy · See more »

Apparent magnitude

The apparent magnitude of a celestial object is a number that is a measure of its brightness as seen by an observer on Earth.

New!!: Cosmic distance ladder and Apparent magnitude · See more »

Asteroid

Asteroids are minor planets, especially those of the inner Solar System.

New!!: Cosmic distance ladder and Asteroid · See more »

Astrometry

Astrometry is the branch of astronomy that involves precise measurements of the positions and movements of stars and other celestial bodies.

New!!: Cosmic distance ladder and Astrometry · See more »

Astronomical spectroscopy

Astronomical spectroscopy is the study of astronomy using the techniques of spectroscopy to measure the spectrum of electromagnetic radiation, including visible light and radio, which radiates from stars and other celestial objects.

New!!: Cosmic distance ladder and Astronomical spectroscopy · See more »

Astronomical unit

The astronomical unit (symbol: au, ua, or AU) is a unit of length, roughly the distance from Earth to the Sun.

New!!: Cosmic distance ladder and Astronomical unit · See more »

Astronomy

Astronomy (from ἀστρονομία) is a natural science that studies celestial objects and phenomena.

New!!: Cosmic distance ladder and Astronomy · See more »

Astronomy & Astrophysics

Astronomy & Astrophysics is a peer-reviewed scientific journal covering theoretical, observational, and instrumental astronomy and astrophysics.

New!!: Cosmic distance ladder and Astronomy & Astrophysics · See more »

Baryon acoustic oscillations

In cosmology, baryon acoustic oscillations (BAO) are regular, periodic fluctuations in the density of the visible baryonic matter (normal matter) of the universe.

New!!: Cosmic distance ladder and Baryon acoustic oscillations · See more »

Binary star

A binary star is a star system consisting of two stars orbiting around their common barycenter.

New!!: Cosmic distance ladder and Binary star · See more »

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.

New!!: Cosmic distance ladder and Black hole · See more »

Bolometer

A bolometer is a device for measuring the power of incident electromagnetic radiation via the heating of a material with a temperature-dependent electrical resistance.

New!!: Cosmic distance ladder and Bolometer · See more »

Calibration

Calibration in measurement technology and metrology is the comparison of measurement values delivered by a device under test with those of a calibration standard of known accuracy.

New!!: Cosmic distance ladder and Calibration · See more »

Centre for Astrophysics and Supercomputing

The Centre for Astrophysics and Supercomputing (CAS) is a research centre located at the Swinburne University in Melbourne, Australia.

New!!: Cosmic distance ladder and Centre for Astrophysics and Supercomputing · See more »

Cepheid variable

A Cepheid variable is a type of star that pulsates radially, varying in both diameter and temperature and producing changes in brightness with a well-defined stable period and amplitude.

New!!: Cosmic distance ladder and Cepheid variable · See more »

Chandrasekhar limit

The Chandrasekhar limit is the maximum mass of a stable white dwarf star.

New!!: Cosmic distance ladder and Chandrasekhar limit · See more »

Charge-coupled device

A charge-coupled device (CCD) is a device for the movement of electrical charge, usually from within the device to an area where the charge can be manipulated, for example conversion into a digital value.

New!!: Cosmic distance ladder and Charge-coupled device · See more »

Chirp mass

The chirp mass of a compact binary star system with component masses m_1 and m_2 is given by \mathcal.

New!!: Cosmic distance ladder and Chirp mass · See more »

Dark energy

In physical cosmology and astronomy, dark energy is an unknown form of energy which is hypothesized to permeate all of space, tending to accelerate the expansion of the universe.

New!!: Cosmic distance ladder and Dark energy · See more »

Distance

Distance is a numerical measurement of how far apart objects are.

New!!: Cosmic distance ladder and Distance · See more »

Distance measures (cosmology)

Distance measures are used in physical cosmology to give a natural notion of the distance between two objects or events in the universe.

New!!: Cosmic distance ladder and Distance measures (cosmology) · See more »

Distance modulus

The distance modulus is a way of expressing distances that is often used in astronomy.

New!!: Cosmic distance ladder and Distance modulus · See more »

Doppler effect

The Doppler effect (or the Doppler shift) is the change in frequency or wavelength of a wave in relation to observer who is moving relative to the wave source.

New!!: Cosmic distance ladder and Doppler effect · See more »

Dynamical parallax

In astronomy, the distance to a visual binary star may be estimated from the masses of its two components, the size of their orbit, and the period of their orbit about one another.

New!!: Cosmic distance ladder and Dynamical parallax · See more »

Earth

Earth is the third planet from the Sun and the only astronomical object known to harbor life.

New!!: Cosmic distance ladder and Earth · See more »

Eddington luminosity

The Eddington luminosity, also referred to as the Eddington limit, is the maximum luminosity a body (such as a star) can achieve when there is balance between the force of radiation acting outward and the gravitational force acting inward.

New!!: Cosmic distance ladder and Eddington luminosity · See more »

Edwin Hubble

Edwin Powell Hubble (November 20, 1889 – September 28, 1953) was an American astronomer.

New!!: Cosmic distance ladder and Edwin Hubble · See more »

Elliptical galaxy

An elliptical galaxy is a type of galaxy having an approximately ellipsoidal shape and a smooth, nearly featureless image.

New!!: Cosmic distance ladder and Elliptical galaxy · See more »

Error

An error (from the Latin error, meaning "wandering") is an action which is inaccurate or incorrect.

New!!: Cosmic distance ladder and Error · See more »

Extinction (astronomy)

In astronomy, extinction is the absorption and scattering of electromagnetic radiation by dust and gas between an emitting astronomical object and the observer.

New!!: Cosmic distance ladder and Extinction (astronomy) · See more »

Faber–Jackson relation

The Faber–Jackson relation provided the first empirical power-law relation between the luminosity L and the central stellar velocity dispersion \sigma of early-type galaxies, and was presented by the astronomers Sandra M. Faber and Robert Earl Jackson in 1976.

New!!: Cosmic distance ladder and Faber–Jackson relation · See more »

Fraunhofer lines

In physics and optics, the Fraunhofer lines are a set of spectral lines named after the German physicist Joseph von Fraunhofer (1787–1826).

New!!: Cosmic distance ladder and Fraunhofer lines · See more »

Friedmann equations

The Friedmann equations are a set of equations in physical cosmology that govern the expansion of space in homogeneous and isotropic models of the universe within the context of general relativity.

New!!: Cosmic distance ladder and Friedmann equations · See more »

Gaia (spacecraft)

Gaia is a space observatory of the European Space Agency (ESA) designed for astrometry: measuring the positions and distances of stars with unprecedented precision.

New!!: Cosmic distance ladder and Gaia (spacecraft) · See more »

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.

New!!: Cosmic distance ladder and Galaxy cluster · See more »

Globular cluster

A globular cluster is a spherical collection of stars that orbits a galactic core as a satellite.

New!!: Cosmic distance ladder and Globular cluster · See more »

Gravitational lens

A gravitational lens is a distribution of matter (such as a cluster of galaxies) between a distant light source and an observer, that is capable of bending the light from the source as the light travels towards the observer.

New!!: Cosmic distance ladder and Gravitational lens · See more »

Gravitational wave

Gravitational waves are the disturbance in the fabric ("curvature") of spacetime generated by accelerated masses and propagate as waves outward from their source at the speed of light.

New!!: Cosmic distance ladder and Gravitational wave · See more »

Hertzsprung–Russell diagram

The Hertzsprung–Russell diagram, abbreviated H–R diagram, HR diagram or HRD, is a scatter plot of stars showing the relationship between the stars' absolute magnitudes or luminosities versus their stellar classifications or effective temperatures.

New!!: Cosmic distance ladder and Hertzsprung–Russell diagram · See more »

Hipparcos

Hipparcos was a scientific satellite of the European Space Agency (ESA), launched in 1989 and operated until 1993.

New!!: Cosmic distance ladder and Hipparcos · See more »

Hubble's law

Hubble's law is the name for the observation in physical cosmology that.

New!!: Cosmic distance ladder and Hubble's law · See more »

Hyades (star cluster)

The Hyades (Greek Ὑάδες, also known as Melotte 25 or Collinder 50) is the nearest open cluster and one of the best-studied star clusters.

New!!: Cosmic distance ladder and Hyades (star cluster) · See more »

Interferometry

Interferometry is a family of techniques in which waves, usually electromagnetic waves, are superimposed causing the phenomenon of interference in order to extract information.

New!!: Cosmic distance ladder and Interferometry · See more »

Inverse-square law

The inverse-square law, in physics, is any physical law stating that a specified physical quantity or intensity is inversely proportional to the square of the distance from the source of that physical quantity.

New!!: Cosmic distance ladder and Inverse-square law · See more »

Jay Pasachoff

Jay Myron Pasachoff (born 1943) is an American astronomer.

New!!: Cosmic distance ladder and Jay Pasachoff · See more »

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.

New!!: Cosmic distance ladder and Kepler's laws of planetary motion · See more »

Kilonova

A kilonova (macronova or r-process supernova) is a transient astronomical event that occurs in a compact binary system when two neutron stars or a neutron star and a black hole merge into each other.

New!!: Cosmic distance ladder and Kilonova · See more »

Large Magellanic Cloud

The Large Magellanic Cloud (LMC) is a satellite galaxy of the Milky Way.

New!!: Cosmic distance ladder and Large Magellanic Cloud · See more »

Light curve

In astronomy, a light curve is a graph of light intensity of a celestial object or region, as a function of time.

New!!: Cosmic distance ladder and Light curve · See more »

Light echo

Reflected light following path B arrives shortly after the direct flash following path A but before light following path C. B and C have the same apparent distance from the star as seen from Earth. A light echo is a physical phenomenon caused by light reflected off surfaces distant from the source, and arriving at the observer with a delay relative to this distance.

New!!: Cosmic distance ladder and Light echo · See more »

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.

New!!: Cosmic distance ladder and Light-year · See more »

LIGO Scientific Collaboration

The LIGO Scientific Collaboration (LSC) is a scientific collaboration of international physics institutes and research groups dedicated to the search for gravitational waves.

New!!: Cosmic distance ladder and LIGO Scientific Collaboration · See more »

Luminosity

In astronomy, luminosity is the total amount of energy emitted per unit of time by a star, galaxy, or other astronomical object.

New!!: Cosmic distance ladder and Luminosity · See more »

Main sequence

In astronomy, the main sequence is a continuous and distinctive band of stars that appear on plots of stellar color versus brightness.

New!!: Cosmic distance ladder and Main sequence · See more »

Metallicity

In astronomy, metallicity is used to describe the abundance of elements present in an object that are heavier than hydrogen or helium.

New!!: Cosmic distance ladder and Metallicity · See more »

Milky Way

The Milky Way is the galaxy that contains our Solar System.

New!!: Cosmic distance ladder and Milky Way · See more »

Minute and second of arc

A minute of arc, arcminute (arcmin), arc minute, or minute arc is a unit of angular measurement equal to of one degree.

New!!: Cosmic distance ladder and Minute and second of arc · See more »

Monthly Notices of the Royal Astronomical Society

Monthly Notices of the Royal Astronomical Society (MNRAS) is a peer-reviewed scientific journal covering research in astronomy and astrophysics.

New!!: Cosmic distance ladder and Monthly Notices of the Royal Astronomical Society · See more »

NASA

The National Aeronautics and Space Administration (NASA) is an independent agency of the executive branch of the United States federal government responsible for the civilian space program, as well as aeronautics and aerospace research.

New!!: Cosmic distance ladder and NASA · See more »

Nature (journal)

Nature is a British multidisciplinary scientific journal, first published on 4 November 1869.

New!!: Cosmic distance ladder and Nature (journal) · See more »

Nebula

A nebula (Latin for "cloud" or "fog"; pl. nebulae, nebulæ, or nebulas) is an interstellar cloud of dust, hydrogen, helium and other ionized gases.

New!!: Cosmic distance ladder and Nebula · See more »

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.

New!!: Cosmic distance ladder and Neutron star · See more »

Nova

A nova (plural novae or novas) or classical nova (CN, plural CNe) is a transient astronomical event that causes the sudden appearance of a bright, apparently "new" star, that slowly fades over several weeks or many months.

New!!: Cosmic distance ladder and Nova · See more »

Olin Chaddock Wilson

Olin Chaddock Wilson (January 13, 1909 – July 13, 1994) was an American astronomer best known for his work as a stellar spectroscopist.

New!!: Cosmic distance ladder and Olin Chaddock Wilson · See more »

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.

New!!: Cosmic distance ladder and Open cluster · See more »

Orbital decay

In orbital mechanics, decay is a process that leads to gradual decrease of the distance between two orbiting bodies at their closest approach (the periapsis) over many orbital periods.

New!!: Cosmic distance ladder and Orbital decay · See more »

Parallax

Parallax is a displacement or difference in the apparent position of an object viewed along two different lines of sight, and is measured by the angle or semi-angle of inclination between those two lines.

New!!: Cosmic distance ladder and Parallax · See more »

Parsec

The parsec (symbol: pc) is a unit of length used to measure large distances to astronomical objects outside the Solar System.

New!!: Cosmic distance ladder and Parsec · See more »

Photosphere

The photosphere is a star's outer shell from which light is radiated.

New!!: Cosmic distance ladder and Photosphere · See more »

Physical cosmology

Physical cosmology is the study of the largest-scale structures and dynamics of the Universe and is concerned with fundamental questions about its origin, structure, evolution, and ultimate fate.

New!!: Cosmic distance ladder and Physical cosmology · See more »

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.

New!!: Cosmic distance ladder and Planetary nebula · See more »

Planetary nebula luminosity function

Planetary nebula luminosity function (PNLF) is a secondary distance indicator used in astronomy.

New!!: Cosmic distance ladder and Planetary nebula luminosity function · See more »

Propagation of uncertainty

In statistics, propagation of uncertainty (or propagation of error) is the effect of variables' uncertainties (or errors, more specifically random errors) on the uncertainty of a function based on them.

New!!: Cosmic distance ladder and Propagation of uncertainty · See more »

Proper motion

Proper motion is the astronomical measure of the observed changes in the apparent places of stars or other celestial objects in the sky, as seen from the center of mass of the Solar System, compared to the abstract background of the more distant stars.

New!!: Cosmic distance ladder and Proper motion · See more »

Proportionality (mathematics)

In mathematics, two variables are proportional if there is always a constant ratio between them.

New!!: Cosmic distance ladder and Proportionality (mathematics) · See more »

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.

New!!: Cosmic distance ladder and Publications of the Astronomical Society of the Pacific · See more »

Quasar

A quasar (also known as a QSO or quasi-stellar object) is an extremely luminous active galactic nucleus (AGN).

New!!: Cosmic distance ladder and Quasar · See more »

Radar

Radar is an object-detection system that uses radio waves to determine the range, angle, or velocity of objects.

New!!: Cosmic distance ladder and Radar · See more »

Radial velocity

The radial velocity of an object with respect to a given point is the rate of change of the distance between the object and the point.

New!!: Cosmic distance ladder and Radial velocity · See more »

Ratio

In mathematics, a ratio is a relationship between two numbers indicating how many times the first number contains the second.

New!!: Cosmic distance ladder and Ratio · See more »

Redshift

In physics, redshift happens when light or other electromagnetic radiation from an object is increased in wavelength, or shifted to the red end of the spectrum.

New!!: Cosmic distance ladder and Redshift · See more »

René Racine

René Racine (born 1939) is a Québécois Canadian professor and astronomer who specializes in the study of globular clusters.

New!!: Cosmic distance ladder and René Racine · See more »

RR Lyrae variable

RR Lyrae variables are periodic variable stars, commonly found in globular clusters.

New!!: Cosmic distance ladder and RR Lyrae variable · See more »

Sigma-D relation

The Sigma-D relation, or Σ-D Relation, is the radio surface brightness to diameter relation of a supernova remnant.

New!!: Cosmic distance ladder and Sigma-D relation · See more »

Small Magellanic Cloud

The Small Magellanic Cloud (SMC), or Nubecula Minor, is a dwarf galaxy near the Milky Way.

New!!: Cosmic distance ladder and Small Magellanic Cloud · See more »

SN 2003fg

SN 2003fg, sometimes called the "Champagne Supernova", was an unusual Type Ia supernova.

New!!: Cosmic distance ladder and SN 2003fg · See more »

Solar System

The Solar SystemCapitalization of the name varies.

New!!: Cosmic distance ladder and Solar System · See more »

Spacecraft

A spacecraft is a vehicle or machine designed to fly in outer space.

New!!: Cosmic distance ladder and Spacecraft · See more »

Spectroscopic parallax

Spectroscopic parallax is an astronomical method for measuring the distances to stars.

New!!: Cosmic distance ladder and Spectroscopic parallax · See more »

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.

New!!: Cosmic distance ladder and Spiral galaxy · See more »

Square root

In mathematics, a square root of a number a is a number y such that; in other words, a number y whose square (the result of multiplying the number by itself, or) is a. For example, 4 and −4 are square roots of 16 because.

New!!: Cosmic distance ladder and Square root · See more »

Standard ruler

A standard ruler is an astronomical object for which the actual physical size is known.

New!!: Cosmic distance ladder and Standard ruler · See more »

Star

A star is type of astronomical object consisting of a luminous spheroid of plasma held together by its own gravity.

New!!: Cosmic distance ladder and Star · See more »

Star cluster

Star clusters are groups of stars.

New!!: Cosmic distance ladder and Star cluster · See more »

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.

New!!: Cosmic distance ladder and Star formation · See more »

Statistics

Statistics is a branch of mathematics dealing with the collection, analysis, interpretation, presentation, and organization of data.

New!!: Cosmic distance ladder and Statistics · See more »

Stellar classification

In astronomy, stellar classification is the classification of stars based on their spectral characteristics.

New!!: Cosmic distance ladder and Stellar classification · See more »

Stellar evolution

Stellar evolution is the process by which a star changes over the course of time.

New!!: Cosmic distance ladder and Stellar evolution · See more »

Stellar parallax

Stellar parallax is the apparent shift of position of any nearby star (or other object) against the background of distant objects.

New!!: Cosmic distance ladder and Stellar parallax · See more »

Stellar population

During 1944, Walter Baade categorized groups of stars within the Milky Way into bluer stars associated with the spiral arms and the general position of yellow stars near the central galactic bulge or within globular star clusters.

New!!: Cosmic distance ladder and Stellar population · See more »

Sun

The Sun is the star at the center of the Solar System.

New!!: Cosmic distance ladder and Sun · See more »

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.

New!!: Cosmic distance ladder and Supernova · See more »

Supernova remnant

A supernova remnant (SNR) is the structure resulting from the explosion of a star in a supernova.

New!!: Cosmic distance ladder and Supernova remnant · See more »

Surface brightness

In astronomy, surface brightness quantifies the apparent brightness or flux density per unit angular area of a spatially extended object such as a galaxy or nebula, or of the night sky background.

New!!: Cosmic distance ladder and Surface brightness · See more »

Surface brightness fluctuation

Surface brightness fluctuation (SBF) is a secondary distance indicator used to estimate distances to galaxies.

New!!: Cosmic distance ladder and Surface brightness fluctuation · See more »

The Astronomical Journal

The Astronomical Journal (often abbreviated AJ in scientific papers and references) is a peer-reviewed monthly scientific journal owned by the American Astronomical Society and currently published by IOP Publishing.

New!!: Cosmic distance ladder and The Astronomical Journal · See more »

The Astrophysical Journal

The Astrophysical Journal, often abbreviated ApJ (pronounced "ap jay") in references and speech, is a peer-reviewed scientific journal of astrophysics and astronomy, established in 1895 by American astronomers George Ellery Hale and James Edward Keeler.

New!!: Cosmic distance ladder and The Astrophysical Journal · See more »

Tip of the red-giant branch

Tip of the red-giant branch (TRGB) is a primary distance indicator used in astronomy.

New!!: Cosmic distance ladder and Tip of the red-giant branch · See more »

Triangle

A triangle is a polygon with three edges and three vertices.

New!!: Cosmic distance ladder and Triangle · See more »

Triangulum Galaxy

The Triangulum Galaxy is a spiral galaxy approximately 3 million light-years (ly) from Earth in the constellation Triangulum.

New!!: Cosmic distance ladder and Triangulum Galaxy · See more »

Tully–Fisher relation

lenticular galaxies In astronomy, the Tully–Fisher relation (TFR) is an empirical relationship between the mass or intrinsic luminosity of a spiral galaxy and its angular velocity or emission line width.

New!!: Cosmic distance ladder and Tully–Fisher relation · See more »

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.

New!!: Cosmic distance ladder and Type Ia supernova · See more »

Universe

The Universe is all of space and time and their contents, including planets, stars, galaxies, and all other forms of matter and energy.

New!!: Cosmic distance ladder and Universe · See more »

Vainu Bappu

Manali Kallat Vainu Bappu (August 10, 1927 – August 19, 1982) was an Indian astronomer and president of the International Astronomical Union.

New!!: Cosmic distance ladder and Vainu Bappu · See more »

Variable star

A variable star is a star whose brightness as seen from Earth (its apparent magnitude) fluctuates.

New!!: Cosmic distance ladder and Variable star · See more »

Velocity

The velocity of an object is the rate of change of its position with respect to a frame of reference, and is a function of time.

New!!: Cosmic distance ladder and Velocity · See more »

Velocity dispersion

In astronomy, the velocity dispersion (σ) is the statistical dispersion of velocities about the mean velocity for a group of objects, such as an open cluster, globular cluster, galaxy, galaxy cluster, or supercluster.

New!!: Cosmic distance ladder and Velocity dispersion · See more »

Venus

Venus is the second planet from the Sun, orbiting it every 224.7 Earth days.

New!!: Cosmic distance ladder and Venus · See more »

Virgo Cluster

The Virgo Cluster is a cluster of galaxies whose center is 53.8 ± 0.3 Mly (16.5 ± 0.1 Mpc) away in the constellation Virgo.

New!!: Cosmic distance ladder and Virgo Cluster · See more »

Virgo interferometer

The Virgo interferometer is a large interferometer designed to detect gravitational waves predicted by the general theory of relativity.

New!!: Cosmic distance ladder and Virgo interferometer · See more »

Visual binary

A visual binary is a gravitationally bound system that can be resolved into two stars.

New!!: Cosmic distance ladder and Visual binary · See more »

Void (astronomy)

Cosmic voids are vast spaces between filaments (the largest-scale structures in the universe), which contain very few or no galaxies.

New!!: Cosmic distance ladder and Void (astronomy) · See more »

Walter Baade

Wilhelm Heinrich Walter Baade (March 24, 1893 – June 25, 1960) was a German astronomer who worked in the United States from 1931 to 1959.

New!!: Cosmic distance ladder and Walter Baade · See more »

Wide Field Camera 3

The Wide Field Camera 3 (WFC3) is the Hubble Space Telescope's last and most technologically advanced instrument to take images in the visible spectrum.

New!!: Cosmic distance ladder and Wide Field Camera 3 · See more »

WiggleZ Dark Energy Survey

The WiggleZ Dark Energy Survey was a large-scale astronomical redshift survey carried out on the 3.9 metre Anglo-Australian Telescope (AAT) at the Siding Spring Observatory, New South Wales between August 2006 and January 2011.

New!!: Cosmic distance ladder and WiggleZ Dark Energy Survey · See more »

Wilson–Bappu effect

The Ca II K line in cool stars is among the strongest emission lines which originates in the star's chromosphere.

New!!: Cosmic distance ladder and Wilson–Bappu effect · See more »

X-ray binary

X-ray binaries are a class of binary stars that are luminous in X-rays.

New!!: Cosmic distance ladder and X-ray binary · See more »

X-ray burster

X-ray bursters are one class of X-ray binary stars exhibiting periodic and rapid increases in luminosity (typically a factor of 10 or greater) that peak in the X-ray regime of the electromagnetic spectrum.

New!!: Cosmic distance ladder and X-ray burster · See more »

Redirects here:

Astronomical scale, Astronomical scales, Cosmic Distance Ladder, Cosmological distance scale, Cosmological ladder, Distance (astronomy), Distance ladder, Extragalactic Distance Scale, Extragalactic distance scale, Main sequence fitting, Standard Candle, Standard candle, Standard candles, Standard siren, Stellar distance.

References

[1] https://en.wikipedia.org/wiki/Cosmic_distance_ladder

OutgoingIncoming
Hey! We are on Facebook now! »