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'''Galaxies''' are assemblies of stars that may often have a [[black hole]] at their center. There may contain anywhere between 10 million to 100 trillion stars. [[Image:Sig06-005 public domain.jpg|thumb|right|200px|a few galaxies]] We can, in theory, observe about 100 billion galaxies. Galaxies have been observed to exist in various shapes: elliptical, spiral, and lens shaped, and irregular. Galaxies usually form into clusters. Clusters are moving apart due to the expansion of the universe. There may be about 500 billion galaxies in the universe. [[File:NGC 4414 (NASA-med).jpg|thumb|A spiral galaxy.]] ==See also== * [[Cosmology]] * [[Intergalactic travel]] * [[Universe]] * [[XMMXCS 2215-1738]] ==Source== * [http://www.universetoday.com/24325/how-many-stars-are-in-galaxies/ Universe Today] [[Category:Astronomy]]
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