The shrinking of the summertime Arctic Ocean icecap in recent decades has raised the question of when the last time the Arctic was ice-free. It turns out this is a hard question to answer due to the ...

Astronomers have long been intrigued by the makeup of the asteroid belt’s largest body. When it was first spotted in 1801, Ceres appeared dry and rocky, its surface marked by craters and dents. For ...

The icy volcanism of Charon may be caused by its internal ocean freezing, expanding, and cracking the outer shell of the moon if it was thinner than expected. When you purchase through links on our ...