"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, like being the first man on the moon, nor is there...

When a young man discovers a time machine, he finds himself stranded in a far off galaxy with no way to return home and nothing to defend himself with against the planet's inhabitants.

"Hailed as "one of the most inventive writers that science fiction has ever produced" (SF Site), Stephen Baxter builds on the massive success of Proxima with a career-defining novel of big ideas.... On the planet of Per Ardua, alien artifacts were discovered--hatches that allowed humans to step across light-years of space as if they were stepping into another room. But this newfound freedom has consequences.... As humanity discovers the real nature...