Comment Re:I think we have other things to worry about (Score 2) 51
Long before then Earth will become uninhabitable.
Actually Earth will not exist at all by then. In about 5-6 billion years our sun will run out of Hydrogen fuel, and will turn into a red giant, which will make Earth barren and without life. After another billion years in that state the sun will shrink, only to ignite massive amounts of Helium, and grow even larger in size than before, swallowing Earth. Finally it will shrink to a white dwarf star, and will still be cooling down when the galaxy crash may or may not happen in 10 billion years.