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A galaxy is a system of stars, stellar remnants, interstellar gas, dust, dark matter, bound together by gravity. The word is derived from the Greek galaxias, literally 'milky', a reference to the Milky Way galaxy that contains the Solar System.
The following is a list of particularly notable actual or hypothetical stars that have their own articles in Wikipedia, but are not included in the lists above. BPM 37093 — a diamond star Cygnus X-1 — X-ray source
Size (left) and distance (right) of a few well-known galaxies put to scale. The following is a list of notable galaxies.. There are about 51 galaxies in the Local Group (see list of nearest galaxies for a complete list), on the order of 100,000 in the Local Supercluster, and an estimated 100 billion in all of the observable universe.
The following well-known stars are listed for the purpose of comparison. Antares (α Scorpii A) 680 [65] AD Fourteenth brightest star in the night sky. [66] Widely recognised as being among the largest known stars. [19] Betelgeuse (α Orionis) 640, [67] 764 +116 −62, [68] 782 ± 55 [69] AD & SEIS Tenth brightest star in the night sky. [66]
The BCG of this cluster was also the most distant galaxy of the time. [51] [53] Gemini Cluster 1932 − 1936 0.075 23 000 The BCG of this cluster was the most distant galaxy at the time. [53] [54] WH Christie's Leo Cluster 1931–1932 19 700 The BCG of this cluster was the most distant galaxy known at the time. [51] [54] [55] [56] [57]
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This is a list of largest galaxies known, sorted by order of increasing major axis diameters. The unit of measurement used is the light-year (approximately 9.46 × 10 12 kilometers). Overview
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