Mars is the fourth planet from the sun and has a distinct rusty red appearance and two unusual moons. The Red Planet is a ...

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.

Why is Mars known as the Red Planet? The answer lies in its striking reddish glow, visible even from Earth. The surface of Mars is covered with iron oxide - commonly known as rust - which gives it a ...

But Phobos won't zip around Mars forever. The doomed moon is spiraling inward at a rate of 1.8 centimeters (seven-tenths of ...