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

Mars, the planet we see today—arid, cold, and covered in red dust—may have once been a "blue planet" with a vast ocean that ...

The finalists for the Ocean Photographer of the Year 2025 have been officially revealed, showcasing breathtaking images that celebrate the ocean’s beauty and highlight the urgent need to protect it.

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

Using images from cameras on Mars orbiters, an international research team has discovered structures on Mars that are very similar to classic river deltas on Earth. These are traces of rivers that ...