Proxima (A Proxima Novel) by Stephen Baxter

Mankind's future in this galaxy could be all but infinite.

There are hundreds of billions of red dwarf stars, lasting trillions of years – and their planets can be habitable for humans. Such is the world of Proxima Centauri. And its promise could mean the never-ending existence of humanity.

But first it must be colonized, and no one wants to be a settler. There is no glamor that accompanies it, nor is there the ease of becoming a citizen of an already-tamed world. There is only hardship…loneliness…emptiness, even as war brews in the solar system.

But that's where Yuri comes in. Because sometimes exploration isn't voluntary. It must be coerced.