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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).
As of 2024, NGC 5468 is the most distant galaxy in which Hubble Space Telescope has detected Cepheid variable stars, which are important milepost markers for measuring distances. [6] NGC 5468 forms a non-interacting pair with NGC 5472, which lies at a projected distance of 5.1 arcminutes. NGC 5468 belongs to the NGC 5493 galaxy group.
It differs from the “light travel distance” since the proper distance takes into account the expansion of the universe, i.e. the space expands as the light travels through it, resulting in numerical values which locate the most distant galaxies beyond the Hubble sphere and therefore with recession velocities greater than the speed of light c.
The Boomerang Nebula is a protoplanetary nebula [2] located 5,000 light-years from Earth in the constellation Centaurus. It is also known as the Bow Tie Nebula and catalogued as LEDA 3074547. [3] The nebula's temperature is measured at 1 K (−272.15 °C; −457.87 °F) making it the coolest natural place currently known in the Universe. [4] [5 ...
For example, the delicate structure of a spiral galaxy in the cluster Abell 3381, located 470 million light-years away, can be seen in the mosaic as well as light blue clouds between the stars in ...
Galaxy group Visible galaxies Notes Local Group: 5 Apart from the Milky Way, only 4 galaxies are visible to the naked eye. [15] Centaurus A/M83 Group: 2 The Centaurus A galaxy has been spotted with the naked eye by Stephen James O'Meara [16] [17] and M83 has also reportedly been seen with the naked eye. [18] M81 Group: 1
The stars themselves are also impressive. Many are red supergiants, like the star Betelgeuse in Earth's galaxy. The galaxy they were found in was formed when the universe was about half its ...
Messier 81 (also known as NGC 3031 or Bode's Galaxy) is a grand design spiral galaxy about 12 million light-years away in the constellation Ursa Major. It has a D 25 isophotal diameter of 29.44 kiloparsecs (96,000 light-years ).