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

Multiple plans exist to explore Mars in the coming decades using robotic and crewed missions. The ultimate goal of these missions is to determine whether human beings could live there someday. This ...

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.