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Why is it possible for galaxies to merge but not stars?

Why is it possible for galaxies to merge but not stars?

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Answer #1

The reason for merge is High velocity collision,

A we know space is very large and there is very large space for stars so they can move without colliding with each other, they are actually very far away to each other.

but for galaxies, galaxies are held together by mutual gravitational force between them and they move around a common center and this leads to collision between galaxies and they merge with eachother and due to this collision many new stars formed.

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