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.

Humans have been exploring Mars since NASA's Viking 1 lander touched down on the red planet on July 20, 1976. Since that time, technology has improved drastically, enabling landers to do all sorts of ...

Clocks do not work the same across the universe and run slower or faster depending on gravity and its strength. Based on the influence of Albert Einstein's theory of general relativity, experts ...

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 ...

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 ...

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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 ...