clipped from: space.newscientist.com   

Galactic merger to 'evict' Sun and Earth


It's hard to know where you'll be in five years' time, never mind 5 billion. But astronomers have it all figured out. In 5 billion years, they say, the Sun and Earth – along with our atomic remains and any living Earthlings – will inhabit "Milkomeda", the wreckage of a violent collision between the Milky Way and the giant Andromeda galaxy.


Now a new study has simulated the crash and asked: where will the Sun end up in this mammoth galactic union? "We're living in the suburbs of the Milky Way right now, but we're likely to move much farther out after the coming cosmic smash-up," concludes T J Cox from the Harvard-Smithsonian Center for Astrophysics (CfA) in Cambridge, Massachusetts, US.


In less than 2 billion years, well within the Sun's lifetime, the Milky Way and Andromeda (above) will pass close to each other. Then they will overshoot and come together again for a second close passage before finally merging about 5 billion years from now. The merged galaxy, dubbed Milkomeda, will be a blobby elliptical galaxy, rather than a neat spiral like Andromeda or the Milky Way today (Image: W Schoening/V Harvey/REU/NOAO/AURA/NSF)