The Hubble team over at NASA has confirmed what it's suspected for a while: that our galaxy is destined for a direct collision with Andromeda, creating the birth of "Milkomeda." Don't expect to see this event because the fireworks won't go off for another four billion years, and last another two billion after that.
In addition, Scientists also predict that the earth won't be threatened thanks to the sheer amount of empty space between stars, but we could lose the sun as its flung out to some other part of the new system.