Hard Science Fiction, Science Fiction || In this sequel to Bowl of Heaven, the expedition is jeopardized by an encounter with an astonishingly immense artifact in interstellar space: a bowl-shaped structure cupping a star, with a habitable area equivalent to many millions of Earths. And which is on a direct path heading toward the same system the human ship is to colonize.
Hard Science Fiction, Science Fiction || For decades, the spacefaring species of Known Space have battled over the largest artifactand grandest prizein the galaxy: the all-but-limitless resources and technology of the Ringworld. But without warning the Ringworld has vanished, leaving behind three rival war fleets. Something must justify the blood and treasure spent. If the fallen civilization of the Ringworld can no longer be despoiled of its secrets, the Puppeteers will be forced to surrender theirs.