It is believed that the universe is expanding and the distance between all galaxies is increasing.
But why is it then written that the Milky Way is moving in the direction of Andromeda, and there will be a moment when these galaxies will collide?

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We explain:
Imagine mosquitoes sitting on the surface of a balloon. The ball is inflated, the distance between the mosses increases, although they themselves do not move. It is a model of an expanding universe. And now let each mole roll somewhere (because galaxies still move in space). If the mosquitoes float faster than the ball, they will easily climb into one point and collide.