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, ...

Mars, the fourth planet from the Sun, is a subject of fascination for astronomers. Though significantly smaller than Earth, this red-hued world has two moons that continue to spark debate among ...

The universe has quasi-moons, mini-moons, and moonlets, but no official definition of what counts as a moon.

A space probe flying past Mars captured images of the red planet's small, mysterious moon. While on a flyby of Mars, Hera was able to use three of its imaging instruments to capture images of Deimos, ...

When Earth is opposite Mars from the sun, it will appear full because you’re looking directly on the daylit side. But ...

The 6%-lit waxing crescent moon will be visible roughly 5 degrees above the horizon as the sun sets on Oct. 23, with Mercury ...

As mankind was planning the first moon landing in the 1960s, an asteroid approached Earth—and still hasn’t left.

See the crescent moon shine with Mars at sunset on Sept. 24. The crescent moon shines close to Mars above the western horizon at sunset on Sept. 24, but you'll need to be quick to spot the red planet ...