In this 1995 Nebula Award-winning novel, a revolution is transforming the formerly passive Earth-colony of Mars. While opposing political factions on Mars battle for the support of colonists, scientists make a staggering scientific breakthrough that at once fuels the conflict and creates a united Mars front, as the technically superior Earth tries to take credit for it. Backed against a wall, colonial leaders are forced to make a monumental decision that changes the future of Mars forever.