The BepiColombo satellite, in orbit around Mercury, photographed the rocky world's north pole for the first time up close. I ...

Frigid air that normally stays trapped in the Arctic has escaped, plunging deep into the United States for an extended visit that is expected to provoke teeth-chattering but not be record-shattering.

Air bubbles within a deep ice core drilled in Antarctica could reveal why Earth suddenly began to experience longer ice ages ...