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Sagot :
Astronomers can learn to simulate the galaxy's collisions on a large computer and watch what the simulation will predict.
What is a galaxy?
A galaxy can be described as a system of stars, interstellar gas, dust, and dark matter, bound together by gravity. Galaxies from 100 million stars range in size from dwarf to million stars to the largest galaxies known as supergiants.
Most of the mass in a galaxy is in the form of dark matter, with only a few percentages of that mass visible as stars and nebulae. Supermassive black holes are a common characteristic at the centers of galaxies.
Galaxies can be categorized according to their visual morphology as elliptical, spiral, or irregular. The Milky Way's central black hole or Sagittarius A* has a mass 4 million times greater than the Sun.
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