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Robert's Quartet is a group of galaxies in Phoenix, named after Robert Freedman. Seyfert's Sextet is a group of galaxies in Serpens, named after Carl Keenan Seyfert. Stephan's Quintet is a group of galaxies in Pegasus, named after Édouard Stephan. Wild's Triplet is a group of galaxies in Virgo, named after Paul Wild. Zwicky's Triplet is a ...
Size (left) and distance (right) of a few well-known galaxies put to scale. There are an estimated 100 billion galaxies in all of the observable universe. [1] On the order of 100,000 galaxies make up the Local Supercluster, and about 51 galaxies are in the Local Group (see list of nearest galaxies for a complete list).
Asteroids at Lagrangian point L 4 are named after Greek characters (such as 588 Achilles), whilst asteroids at L 5 are named after Trojans (such as 884 Priamus). Small Jupiter trojans with absolute magnitudes fainter than 12 (in the V band) can be named for Olympic athletes. [22] [28]
Many dwarf galaxies may orbit a single larger galaxy; the Milky Way has at least a dozen such satellites, with an estimated 300–500 yet to be discovered. [107] Most of the information we have about dwarf galaxies come from observations of the local group, containing two spiral galaxies, the Milky Way and Andromeda, and many dwarf galaxies.
The observable universe contains as many as an estimated 2 trillion galaxies [95] [96] [97] and, overall, as many as an estimated 10 24 stars [98] [99] – more stars (and earth-like planets) than all the grains of beach sand on planet Earth; [100] [101] [102] but less than the total number of atoms estimated in the universe as 10 82; [103] and ...
[67]: 879 About a quarter of all galaxies are irregular, and the peculiar shapes of such galaxies may be the result of gravitational interaction. [ 93 ] An active galaxy is a formation that emits a significant amount of its energy from a source other than its stars, dust and gas.
Contains about 56,000 galaxies, located 820 million light years away. BOSS Great Wall (BGW) (2016) 1,000,000,000: Structure consisting of 4 superclusters of galaxies. The mass and volume exceeds the amount of the Sloan Great Wall. [22] Perseus–Pegasus Filament (1985) 1,000,000,000: This galaxy filament contains the Perseus–Pisces Supercluster.
2013 – The galaxy Z8 GND 5296 is confirmed by spectroscopy to be one of the most distant galaxies found up to this time. Formed just 700 million years after the Big Bang, expansion of the universe has carried it to its current location, about 13 billion light years away from Earth (30 billion light years comoving distance). [18]