Eon

Eon (1985) by Greg Bear is a landmark science fiction novel that opens with the sudden appearance of a mysterious asteroid, known as "The Stone," in Earth’s orbit. Inside, explorers discover vast chambers, advanced technology, and evidence of alternate timelines. The book blends hard science fiction with philosophical questions about humanity’s future, time travel, and parallel universes. It is the first in Bear’s The Way series and is widely praised for its imaginative scope and scientific rigor