There are two small moons in orbit around Mars today, but both may be remnants of a much larger moon that had enough of a ...

Mars looks quiet today, but new research suggests the planet’s surface still carries the rhythm of a vanished companion.

In a new study featured by New Scientist, researchers propose that Mars might have once had a much larger moon than it does ...

Phobos is the larger and innermost of Mars' two moons, and it's a fascinating celestial body. It's small, irregularly shaped, and orbiting just about 6,000 kilometers above the surface of the Red ...

One summer night in 1877, American astronomer Asaph Hall was looking through his telescope in Washington, D.C. Mars was at its closest point to Earth in its orbit, and Hall had one question on his ...

Red Planet Day reminds us how a single spacecraft, Mariner 4, transformed humanity's understanding of Mars and opened a new era of planetary exploration.

NASA's Europa Clipper spacecraft is on a journey to Jupiter's moon, Europa, a frozen world believed to harbor a salty ocean beneath its icy crust — and possibly the conditions to support life. - NASA ...

As an astronomer studying the universe beyond Earth, I’m fond of “outside the box” views almost by default. But one of my favorites is whenever a spacecraft takes a snapshot of our home world and the ...