Why doesn't our solar system run into other solar systems over billions of years. There is plenty of time for it to be attracted by gravity to other objects. So I thought, it should be a common occurrence? or is there a reason it is not a common occurrence?

  • $\begingroup$ Stars orbit the galaxy's centre, a supermassive black hole, so they don't really draw one another together in a collision-inducing manner. They also occupy so little of the galaxy's volume it's likely the Milky Way's eventual merge with Andromeda won't cause any collisions either. $\endgroup$
    – J.G.
    Commented Mar 18, 2018 at 20:01

1 Answer 1


Space is big. You just won't believe how vastly, hugely, mind- bogglingly big it is. I mean, you may think it's a long way down the road to the chemist's, but that's just peanuts to space.

Douglas Adams, Hitchhikers Guide to the Galaxy

  • 3
    $\begingroup$ Geeks think the same way. I was coming to quote the same line. But you should note that it's from Douglas Adams. $\endgroup$ Commented Dec 5, 2011 at 16:31
  • $\begingroup$ en.wikipedia.org/wiki/Andromeda%E2%80%93Milky_Way_collision for galaxy collision $\endgroup$
    – anna v
    Commented Mar 18, 2018 at 17:02
  • $\begingroup$ @annav True, but that's because of gravity. When galaxies collide, stars and solar systems still don't collide. :O $\endgroup$
    – JasonR
    Commented Apr 2, 2018 at 11:44

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