In orbit around the white planet is a single cratered moon. You are gazing on Earth in the Cryogenian period, 700 million years ago. This is about three times as long ago as the earliest dinosaurs ...

Around 700 million years ago, Earth was a very different planet—gripped by extreme deep freezes during the Cryogenian period. Enormous glaciers, kilometers thick, stretched across vast regions ...

In orbit around the white planet is a single cratered moon. You are gazing on Earth in the Cryogenian period, 700 million years ago. This is about three times as long ago as the earliest dinosaurs ...

In orbit around the white planet is a single cratered moon. You are gazing on Earth in the Cryogenian period, 700 million years ago. This is about three times as long ago as the earliest dinosaurs ...