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The galaxy may have once had some 10 billion stars. [8] As of 2013, it is possibly the densest known galaxy with over one hundred stars per cubic light-year. [9] As of 2014, it is the smallest and least massive galaxy known to host a central black hole. It was previously known as the most massive ultracompact dwarf galaxy known. [8]
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.
Markov (telescopic asterisms) (for example: Markov 1 in Hercules) MAXI — Monitor of All-sky X-ray Image. Mayall — Nicholas Mayall (for example: globular star cluster Mayall II orbiting Messier 31, the Andromeda galaxy) Mayer (open star clusters) McC — McCormick Observatory Catalog. MCG — Morphological Catalogue of Galaxies.
The following well-known stars are listed for the purpose of comparison. Antares (α Scorpii A) 680 [71] AD Fourteenth brightest star in the night sky. [72] Widely recognised as being among the largest known stars. [26] Betelgeuse (α Orionis) 640, [73] 764 +116 −62, [74] 782 ± 55 [75] AD & SEIS Tenth brightest star in the night sky. [72]
UDF 2457 is the Hubble Ultra Deep Field (UDF) identifier for a red dwarf star calculated to be about 59,000 light-years (18 kiloparsecs) from Earth [2] with a very dim apparent magnitude of 25. [1] The Milky Way galaxy is about 100,000 light-years in diameter, [3] and the Sun is about 25,000 light-years from the Galactic Center. [4]
List of largest galaxies. A image of the supergiant elliptical galaxy . are some of the largest galaxies known. The is a colossal spiral galaxy disturbed by the smaller . It is the largest known spiral galaxy with the isophotal diameter of over 717,000 (220 ). [1]
List of most massive black holes. The supermassive black hole at the core of Messier 87, here shown by an image by the Event Horizon Telescope, is among the black holes in this list. This is an ordered list of the most massive black holes so far discovered (and probable candidates), measured in units of solar masses (M☉), approximately 2 × ...
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]