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.

A giant collision in Mars’ early history created a global magma ocean and buried large fragments of debris deep within the young planet. As Mars cooled, it formed a solid crust — eventually becoming a ...

Millions of mysterious black streaks littered across the surface of Mars have puzzled scientists for decades, but now researchers may finally have a proper explanation. The new theory also explains ...

Mars's atmosphere and climate are impacted by interactions with solar wind, a stream of plasma comprised of protons and electrons that flows from the sun's outermost atmosphere (corona), traveling at ...

Billions of years ago, Mars’ Jezero Crater held a lake fed by rivers that could have carried minerals and maybe even organic matter. On Earth, places like that are teeming with microbial life. NOVA is ...