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Why do galaxies collide?

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Why do galaxies collide?

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Galaxies do not live separately. The intensity of gravity holds them together. The galaxies communities are called clusters of galaxies. In the central regions of these clusters are agglomerated a lot of galaxies that are moving quickly. They obey gravitational forces exerted by neighboring galaxies. The relative velocities between galaxies are about a few thousand kilometers per second. The typical distances between galaxies in these areas are only about 5 million light-years. Collisions between galaxies are therefore relatively common. It is estimated there is a crash every few hundred million years in each cluster of galaxies.

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