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physical object > natural object > celestial body > collection of stars > collection of galaxies > hypergalaxy

hypergalaxy
subject			fact

hypergalaxy	has definition A system consisting of a dominant spiral galaxy surrounded by a cloud of dwarf satellite galaxies, often ellipticals.
	is a kind of collection of galaxies
collection of galaxies	has number of galaxies
collection of stars	has number of stars
	has catalog catalog about star systems
celestial body	has spectra
physical object	has location or center of gravity
	has angular momentum
	has mass
	has velocity
	has momentum
	has temperature
	has volume
	has extent
	has material

Kinds of hypergalaxy :

• Andromeda galaxy (13 facts) (M 31) - Major spiral galaxy, 2.2 million light-years from Earth. Gravitationally bound to the Milky Way with which it shares membership in the Local Group, it is currently approaching us, rather than receding as is the case for most galaxies., A spiral galaxy (kS5 in Morgan's classification) in the Local Group, about 650-700 kpc distant (M_V = -21), visible to the naked eye as a fuzzy patch in the constellation of Andromeda. Total mass about 3.1 × 10¹¹ M_sun ; i = 77°, heliocentric velocity - 180 km s^-1. Its nucleus exhibits noncircular gas motions. It is similar to but slightly larger than our Galaxy., The largest galaxy in the Local Group. Also known as the Great Spiral and M31. It is about one and a half times the size of our own galaxy, and contains at least 300 globular clusters. Two smaller, elliptical galaxies (M32 and NGC 205) lie close to it., The largest member of the local group. It is a giant spiral galaxy that lies 2.4 million light-years away.
• Milky Way (9 facts) - System of approximately 100000 million stars, of which our Sun is one. It is a normal spiral galaxy of class Sb, with a diameter now reckoned to be probably less than 100,000 light-years, and a strong but obscure energy source at the center (emitting infrared radiation). It is undergoing galactic rotation. Possibly one tenth of the galaxy's total mass - estimated at 1.8 × 10¹¹ solar masses - comprises interstellar gas and dust., The galaxy to which the Sun belongs. Our Galaxy is about 10¹⁰ years old and contains about 10¹¹ stars. Its mass is at least 10¹¹ M_sun, about 5-10 percent of which is in the form of gas and dust. Diameter ~ 30 kpc; thickness of nuclear bulge about 4 kpc; thickness of disk about 700-800 pc; distance between spiral arms about 1.4 kpc. M_v = - 20.5. Mean density about 0.1 M_sun per cubic parsec. Magnetic field about 3-5 × 10^-6 gauss. Total luminosity about 10⁴⁴ ergs s^-1, Our own galaxy, the second largest in the local group., A softly glowing band of light that bisects the skies of Earth, produced by light from stars and nebulae in the galactic disk.