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The Sculptor Galaxy (NGC 253) is a disk galaxy. A disc galaxy (or disk galaxy) is a galaxy characterized by a galactic disc. This is a flattened circular volume of stars that are mainly orbiting the galactic core in the same plane. [1] These galaxies may or may not include a central non-disc-like region (a galactic bulge). [2]
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 ).
The Sculptor Galaxy (NGC 253) is an example of a disc galaxy. A galactic disc (or galactic disk) is a component of disc galaxies, such as spiral galaxies like the Milky Way and lenticular galaxies. Galactic discs consist of a stellar component (composed of most of the galaxy's stars) and a gaseous component (mostly composed of cool gas and dust).
An accretion disk is a structure (often a circumstellar disk) formed by diffuse material [a] in orbital motion around a massive central body. The central body is most frequently a star . Friction , uneven irradiance, magnetohydrodynamic effects, and other forces induce instabilities causing orbiting material in the disk to spiral inward toward ...
Image of a dead disk galaxy. A dead disk galaxy is a type of galaxy that is no longer able to form new stars. These galaxies are usually massive yet compact, fast spinning disk shaped galaxies. Most of these galaxies stopped forming new stars billions of years ago when the universe was relatively young in age. [1]
From 1 billion years, and for about 12.8 billion years, the universe has looked much as it does today and it will continue to appear very similar for many billions of years into the future. The thin disk of our galaxy began to form when the universe was about 5 billion years old or 9 ± 2 Gya. [15]
The thick disk is a source of early kinematic and chemical evidence for a galaxy's composition and thus is regarded as a very significant component for understanding galaxy formation. With the availability of observations at larger distances away from the Sun, more recently it has become apparent that the Milky Way thick disk does not have the ...
The thin disk contributes about 85% of the stars in the Galactic plane [3] and 95% of the total disk stars. [2] It can be set apart from the thick disk of a galaxy since the latter is composed of older population stars created at an earlier stage of the galaxy formation and thus has fewer heavy elements. Stars in the thin disk, on the other ...