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

Astronomers have spent the past decade cataloguing thousands of planets beyond the solar system, many of them falling into a ...

Despite its small size, Mars seems to have a huge impact on the orbital cycles that govern Earth’s climate, especially those ...

The origin of super-Earths and sub-Neptunes has been revealed in a system of four young planets that are dramatically losing ...

In addition to shaping the interior of rocky planets, molten rock located deep within these planets may also contribute to ...

"I don't think anyone's made this connection between the surface fluid pattern and the interior properties of these planets." ...

Spacecraft orbiting the Red Planet have helped researchers map out an ancient coastline that surrounded a large ocean billions of years ago ...

For many years, astronomers have been looking for extraterrestrial life. In doing so, astronomers have narrowed their search ...

For decades, the number of planets seemed settled and unquestioned. Then definitions changed, discoveries multiplied, and certainty disappeared. The issue was never distance or size alone, but ...

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

NASA has revealed a terrifying glimpse into our solar system 's grizzly fate. In five billion years, scientists believe the ...

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 ...