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Andromeda, a massive spiral galaxy, has swallowed several galaxies within the last few billion years before setting its sights on the Milky Way.[theregister.co.uk...]
"The Milky Way is on a collision course with Andromeda in about four billion years,” said Dougal Mackey, co-author of a new study published in Nature and a research fellow at the Australian National University. “So knowing what kind of a monster our galaxy is up against is useful in finding out the Milky Way's ultimate fate."
As long as there is coffee it does not matter :)
1 billion year later, the sun will turn into a giant red