The summer sky was unusually cloud-free when NASA's Aqua satellite passed over the Antarctic Peninsula.

Rainfall from an ex-tropical cyclone raised the river to record-high levels, flooding and isolating nearby communities.

Tracking dunes with satellite images over years and decades reveals small dunes regularly popping up and passing larger crescent-shaped barchan dunes.

This astronaut photograph illustrates the undulating geology of a segment of the mountain range in southern Iran.

Greenland's largest ice stream is expected to contribute more to sea level rise than models previously indicated.

The latest in a series of atmospheric rivers drenching the state was accompanied by hazardous winds and left thousands of people without power.

The configuration of the polar vortex may have played a role in unleashing bitter cold followed by record warmth in North America.