Relax, galaxies are mostly empty space, so the chances of anything hitting anything else is tiny ... & it's 3.75 billion years from now, so most of us will be dead anyway.
http://www.gizmodo.com.au/2012/06/earths-sky-will-be-mind-blowing-3-75-billion-years-from-now/
/ astronomer astronomy space orbit gravity /
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