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24 April, 22:50

Why are the milky way and andromeda colliding when the universe is expanding?

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  1. 25 April, 00:21
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    It is believed that the force of repulsion expanding the universe is due to dark energy, i. e. the energy of the vacuum, which is anti-gravitational. This is the force which is pushing the galaxies apart. However, if galaxies are close together, their local gravity can overcome this repulsion.
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