Ring - Xeelee Sequence, Bk 4 Author:Stephen Baxter Michael Poole's wormholes constructed in the orbit of Jupiter had opened the galaxy to humankind. Then Poole tried looping a wormhole back on itself, tying a knot in space and ripping a hole in time. — It worked. Too well. — Poole was never seen again. Then from far in the future, from a time so distant that the stars themselves ... more »were dying embers, came an urgent SOS -- and a promise. The universe was doomed, but humankind was not. Poole had stumbled upon an immense artifact, light-years across, fabricated from the very string of the cosmos.