Billions of years ago, water flowed across Mars. Most scientists agree the red planet had rivers. But did those rivers flow ...

Mars is accelerating toward Earth, with gravity from our planet causing Mars to crack under intense pressure. Though Mars is unlikely to break apart before moving past Earth, the event could have ...

A fleet of ball-shaped rovers could drift across the Martian surface like tumbleweed, driven simply by the wind.

Mars is usually a safe 225 million kilometers away from Earth, but what if the red planet went off course and headed straight toward us? This nightmare scenario would cause devastation long before the ...

Late-stage planetary collisions reshaped Earth and its neighboring planets, delivering water, altering their atmospheres, and ...