Astronomer Avi Loeb suggests that a quasi-satellite may be the "relic of an interplanetary mission by humanity from the 1960s ...

Mars has two moons, but they're not quite like Earth's moon. That's raised a lot of questions about where they're from, ...

On Aug. 17, 1877, American astronomer Asaph Hall discovered Mars's moon Phobos. Hall was working at the U.S. Naval Observatory in Washington, D.C. and looking through a 26-inch refractor telescope — ...

A NASA rover captured images of a Martian eclipse that resembled a googly-eye peering down at the red planet. The space agency released photos and video Wednesday that show the Martian moon Phobos ...

The Perseverance Mars rover's Mastcam-Z camera the Martian moon Phobos transit the Sun. See real-time and time-lapsed views ...

A weapon probably didn't cause Russia's Phobos-Grunt spacecraft to fail (it's set to enter Earth's orbit next week), but that's a better story than than saying you built space junk. It also makes for ...