Do any of the galaxies appear to be closer to each other as your universe expands? What does this say about the possibility of galaxies colliding with each other?

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Physics

Rayna

21 March, 17:40

Do any of the galaxies appear to be closer to each other as your universe expands? What does this say about the possibility of galaxies colliding with each other?

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Beyonce · Answer 1

In local galactic group the force of expansion of universe is overcome by the force of attraction due to gravity. Best example is our own galaxy milky way and another giant galaxy in our local group Andromeda. Andromeda having enormous gravity is pulling milky way towards itself, overcoming the force of expansion.

So, there are possibilities of collision despite the expansion of universe at a rapid pace. It is estimated that the milky way and Andromeda will collide each other after about 50 billion years from now.