Throughout Earth's history, ice caps have been very rare, but a model of the past 420 million years suggests an explanation ...

Explore Ceres, the largest asteroid in our solar system, and discover its remarkable ancient ocean and ice-rich crust.

Beneath the rolling hills of the Appalachian Basin, an ancient rock formation holds what some are calling America’s greatest untapped energy resource. The Marcellus Shale, formed over 400 million ...