What evidence is there that galaxies collide and merge?


What evidence is there that galaxies collide and merge?

Galaxies in the Universe:

A galaxy is an isolated, bound system supported by gravity, and its members are stars, interstellar medium, and dark matter. There are more than a billion of galaxies in the Universe, and they are the basic building blocks of a large scale structure.

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Generally, the main shapes of galaxies can be classified into ellipticals, spirals, and irregulars. About 90 % of the galaxy's mass is dark matter,...

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The Collision & Assembly of Galaxies


Chapter 4 / Lesson 1

When galaxies collide or pass near each other, they can merge, break up, or absorb other galaxies. Learn about collisions and assemblies, collisions and starbursts, galactic cannibalism, and spiral arms and bars.

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