When researchers reconstructed lava flows on Mars, they realized the red planet is a lot more active than they previously thought.

"This is the first tangible evidence we've seen that the ancient climate of Mars had such regular, Earth-like wet-dry cycles."

To understand how the paths of meandering rivers change over time, researchers looked at the Mississippi and at ancient riverbeds on Mars.

"...Hansel and Gretel dropped breadcrumbs to make sure they'd find their way back. In our scenario, the 'breadcrumbs' are miniaturized sensors..."

Do manganese oxides support the theory that Mars once had more oxygen? New experiments contradict that view.

New research digs into rock glaciers on our home planet, but the findings could help scientists get a deeper understanding of Mars, too.

Mars has generally been considered geologically dead. But marsquakes indicate volcanic activity still plays a role in shaping its surface.

Researchers simulated the conditions hypothetical lifeforms would have encountered on Mars 4 billion years ago.

Simulated Mars dust and titanium alloy combine to make a 3D printed material that could one day become tools or rocket parts on Mars.

Rocks on Mars that date back nearly 4 billion years are composed of large grains of olivine, which tints Hawaiian beaches green back on Earth.