One summer night in 1877, American astronomer Asaph Hall was looking through his telescope in Washington, D.C. Mars was at ...

A new panorama from NASA's 2001 Mars Odyssey orbiter shows one of the red planet's biggest volcanoes, Arsia Mons, poking through a canopy of clouds just before dawn.

Mars has two moons; the other is Phobos. They were named for the sons of god of war Ares, the Greek counterpart for the Roman god Mars; their names mean fear (Phobos) and dread (Deimos). There are ...