The new images highlight how dramatically different Mars' climate and geology were during its early history.

This month, ESA's Mars Express takes us to Shalbatana Vallis: a fascinating Martian valley surrounded by signs of water, lava ...

A NASA robot has taken a 'selfie' on the surface of Mars as the space agency continues to gather detail on the Red Planet in ...

For years, scientists have been intrigued by mysterious dark streaks running down the slopes of Martian cliffs and craters. These marks, called slope streaks and recurring slope lineae (RSLs), have ...

NASA's Curiosity rover has been exploring Mars for 14 years. See a new timelapse showing six years of wear and tear on its ...

The rusty world is full of mysteries—and some of the solar system's most extreme geology. Learn more about Earth's smaller, colder neighbor.

"This experiment's never been run before on another world," said Amy Williams, an astrobiologist working on the Curiosity mission.

Liquid water once shaped the Martian landscape dramatically, carving valleys, filling lakes, and forming vast oceans. Billions of years ago, during Mars' early days known as the Noachian and Hesperian ...