Why does biodiversity wax near the equator and wane approaching Earth’s poles?

A study of lunar rocks sheds new light on the origins of the Earth and its moon.

Questions for geologist Susan Kidwell on her work in the emerging discipline of conservation paleobiology, teaching students out in the field, and what artists and scientists share.

Astronomers and planetary scientists debate if and when we’ll find extraterrestrial life.

New research explains sustained eruptions on an icy moon of Saturn.

Scientist Thomas Stephan catches up with a comet.