Earth is in danger from cosmic catastrophe and alien overlords. Discoveries made by colonists on the moons of Saturn show that the Solar System has undergone repeated cataclysms and the last was only a few thousand years. This flies in the face of accepted scientific dogma, and is dismissed by Earth's authorities--until the planet Jupiter suddenly emits a white-hot Earth-sized protoplanet that hurtles sunward on a collision course with Earth. .

"A Baen Books Original."

Cradle of Saturn -- The legend that was Earth.