The Thousand Earths - Stephen Baxter

In 2145AD John Hackett's adventure is just beginning.

In Year 30, Mela's story is coming to a close.

Hackett, in his trusty ship the Perseus, is not just a space traveller - beginning his travels with an expedition to Neptune and back - but, thanks to the time-dilation effect, a time traveller as well. His new mission will take him to Andromeda, to get a close-up look at the constellation which will eventually crash into the Milky Way, and give humanity a heads-up about the challenges which are coming.

A mission which will take him five million years to complete.

Not only is Hacket