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18 relations: Active galactic nucleus, Comoving and proper distances, Epoch (astronomy), Giga-, Hubble Space Telescope, Leo Minor, Light-year, NASA, NASA/IPAC Extragalactic Database, Nature (journal), Parsec, Principal Galaxies Catalogue, Radio galaxy, Sky-Map.org, Space Telescope Science Institute, Starburst region, Stefi Baum, Universe.
Active galactic nucleus
An active galactic nucleus (AGN) is a compact region at the center of a galaxy that has a much higher than normal luminosity over at least some portion—and possibly all—of the electromagnetic spectrum, with characteristics indicating that the excess luminosity is not produced by stars.
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Comoving and proper distances
In standard cosmology, comoving distance and proper distance are two closely related distance measures used by cosmologists to define distances between objects.
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Epoch (astronomy)
In astronomy, an epoch is a moment in time used as a reference point for some time-varying astronomical quantity, such as the celestial coordinates or elliptical orbital elements of a celestial body, because these are subject to perturbations and vary with time.
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Giga-
Giga is a unit prefix in the metric system denoting a factor of a (short-form) billion (109 or 000).
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Hubble Space Telescope
The Hubble Space Telescope (HST) is a space telescope that was launched into low Earth orbit in 1990 and remains in operation.
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Leo Minor
Leo Minor is a small and faint constellation in the northern celestial hemisphere.
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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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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.
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NASA/IPAC Extragalactic Database
The NASA/IPAC Extragalactic Database (NED) is an on-line astronomical database for astronomers that collates and cross-correlates astronomical information on extragalactic objects (galaxies, quasars, radio, x-ray and infrared sources, etc.). NED was created in the late 1980s by two Pasadena astronomers, George Helou and Barry F. Madore.
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Nature (journal)
Nature is a British multidisciplinary scientific journal, first published on 4 November 1869.
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Parsec
The parsec (symbol: pc) is a unit of length used to measure large distances to astronomical objects outside the Solar System.
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Principal Galaxies Catalogue
The Catalogue of Principal Galaxies (PGC) is an astronomical catalog published in 1989 that lists B1950 and J2000 equatorial coordinates and cross-identifications for 73,197 galaxies.
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Radio galaxy
Radio galaxies and their relatives, radio-loud quasars and blazars, are types of active galaxy that are very luminous at radio wavelengths, with luminosities up to 1039 W between 10 MHz and 100 GHz.
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Sky-Map.org
Sky-Map.org (or WikiSky.org) is a wiki and interactive sky map that covers more than half a billion celestial objects.
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Space Telescope Science Institute
The Space Telescope Science Institute (STScI) is the science operations center for the Hubble Space Telescope (HST; in orbit since 1990) and for the James Webb Space Telescope (JWST; scheduled to be launched in March 2021).
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Starburst region
A starburst is an astrophysical process that involves star formation occurring at a rate that is large compared to the rate that is typically observed.
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Stefi Baum
Stefi Baum (born December 11, 1958 in Chicago, Illinois) is an American astronomer.
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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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3C 236 North, 3C 236 South, 3C 326 North, 3C236, Galaxy 3C236, QSO B1003+351.
