“The presence of liquid water [on Mars] is a broad topic that includes rains, rivers, lakes, as well as oceans,” says Ezat ...

"The structures that we were able to identify in the images are clearly the mouth of a river into an ocean." The post ...

Mars may have been a "blue planet" with an ocean the size of today's Arctic Ocean, a new study suggests.

Our planet is unique for its ability to sustain abundant life. From studies of the rock record, scientists believe life had already emerged on Earth at least 3.5 billion years ago and probably much ...

Close to the summit of an underwater mountain west of the Mid-Atlantic Ridge, a jagged landscape of towers rises from the ...

Every year, gray whales embark on one of nature’s most epic migration journeys. Here’s what we know about it, according to ...

The world's first legally binding agreement to protect marine life in international waters took effect Saturday. Here's what ...

Climate change is shifting the weather patterns of Earth in ways that are far-reaching and long-lasting, and a new study details a noticeable rise in extreme weather events in the Arctic, prompted by ...

A new decade-long study tracked 37 penguin colonies and found that the birds are breeding earlier. The shift marks one way ...

About 700 million years ago, Earth was entombed in a veneer of ice hundreds of feet thick—a frozen state scientists refer to as “Snowball Earth.” Oceans cooled but managed to retain some heat to avoid ...

For years, astronomers have celebrated every hint of an ocean on a distant world as a potential foothold for life. Now a new wave of modeling argues that most of those supposed seas are illusions, and ...

Seaweed bathing in Ireland, a trek through Africa’s first designated wilderness quiet park—we asked National Geographic staff ...