Andromeda is headed our way at around 120km/second

Andromeda is headed our way at around 120km/second and is predicted to collide with the Milky Way galaxy in three or four billion years. The result, if anybody is around to see it, will be beautiful. As there's so much empty space and such large distances between stars, the two galaxies will pass through each other first and it's very unlikely any stars will collide, but dust and clouds will, meaning the rate of star creation will be greatly boosted and supernovae will become more common.