For much of the planet’s recent geological history, ice ages came and went every 41,000 years. Then, during a period ...

On the slopes of Martian mountains and craters clings what appears to be flowing honey, coated in dust and frozen in time. In ...

Here, deep into the Arctic Circle and midway between Norway and the north pole, he is investigating the health of the glaciers, by comparing them to what they looked like in archival photos. ...