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28 relations: Carl Keenan Seyfert, Constellation, Distance, Elliptical galaxy, Epoch (astronomy), Galaxy, Gravity, Hubble Space Telescope, Light-year, M81 Group, Messier 82, Mineral dust, Nebula, New General Catalogue, Orders of magnitude (length), Parsec, Peculiar galaxy, Principal Galaxies Catalogue, Second, Seyfert galaxy, Spectral line, Spiral galaxy, Surface brightness fluctuation, Tip of the red-giant branch, Uppsala General Catalogue, Ursa Major, William Henry Smyth, William Herschel.
Carl Keenan Seyfert
Carl Keenan Seyfert (February 11, 1911 – June 13, 1960) was an American astronomer.
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Constellation
A constellation is a group of stars that are considered to form imaginary outlines or meaningful patterns on the celestial sphere, typically representing animals, mythological people or gods, mythological creatures, or manufactured devices.
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Distance
Distance is a numerical measurement of how far apart objects are.
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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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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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Galaxy
A galaxy is a gravitationally bound system of stars, stellar remnants, interstellar gas, dust, and dark matter.
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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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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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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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M81 Group
The M81 Group is a galaxy group in the constellations Ursa Major and Camelopardalis that includes the galaxies Messier 81 and Messier 82, as well as several other galaxies with high apparent brightnesses.
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Messier 82
Messier 82 (also known as NGC 3034, Cigar Galaxy or M82) is a starburst galaxy approximately 12 million light-years away in the constellation Ursa Major.
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Mineral dust
Mineral dust is a term used to indicate atmospheric aerosols originated from the suspension of minerals constituting the soil, being composed of various oxides and carbonates.
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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.
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New General Catalogue
The New General Catalogue of Nebulae and Clusters of Stars (abbreviated as NGC) is a catalogue of deep-sky objects compiled by John Louis Emil Dreyer in 1888.
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Orders of magnitude (length)
The following are examples of orders of magnitude for different lengths.
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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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Peculiar galaxy
A peculiar galaxy is a galaxy of unusual size, shape, or composition.
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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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Second
The second is the SI base unit of time, commonly understood and historically defined as 1/86,400 of a day – this factor derived from the division of the day first into 24 hours, then to 60 minutes and finally to 60 seconds each.
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Seyfert galaxy
Seyfert galaxies are one of the two largest groups of active galaxies, along with quasars.
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Spectral line
A spectral line is a dark or bright line in an otherwise uniform and continuous spectrum, resulting from emission or absorption of light in a narrow frequency range, compared with the nearby frequencies.
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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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Surface brightness fluctuation
Surface brightness fluctuation (SBF) is a secondary distance indicator used to estimate distances to galaxies.
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Tip of the red-giant branch
Tip of the red-giant branch (TRGB) is a primary distance indicator used in astronomy.
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Uppsala General Catalogue
The Uppsala General Catalogue of Galaxies (UGC) is a catalogue of 12,921 galaxies visible from the northern hemisphere.
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Ursa Major
Ursa Major (also known as the Great Bear) is a constellation in the northern sky, whose associated mythology likely dates back into prehistory.
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William Henry Smyth
Admiral William Henry Smyth KFM DCL FRS FRAS FRGS FSA (21 January 1788 – 8 September 1865) was a Royal Navy officer, hydrographer, astronomer and numismatist.
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William Herschel
Frederick William Herschel, (Friedrich Wilhelm Herschel; 15 November 1738 – 25 August 1822) was a German-born British astronomer, composer and brother of fellow astronomer Caroline Herschel, with whom he worked.
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References
[1] https://en.wikipedia.org/wiki/NGC_3077
