The moon performed a cosmic ballet with Mars this week.

Deimos is Mars' outer moon. It's a tiny, irregularly shaped moon and smaller than Mars' other moon, Phobos. Despite being unspectacular, Deimos remains a fascinating mystery. Deimos is one of only ...

So I grabbed my camera, ran outside, and looked up just as Mars was supposed to emerge from the Moon's curved horizon. Seen ...

Mars is home to perhaps the greatest mystery of the solar system: the so-called Martian dichotomy, which has baffled ...

Formations that look like jumbo-sized kidney beans (or blobs of chocolate syrup, depending on your palette) may be indicators ...

For a few months, Earth had a second moon — a tiny asteroid that may have been a piece of our own Moon ...

Big missions in 2025 will study everything from water on the Moon to the transformation of our universe after the big bang ...

NASA has plans to launch the first deep space station for humans to live long-term. Is it a necessary step to Mars?

A famous illustration of Saturn's moon Titan got it all wrong. Never mind -- what we imagine space to be, and what we know it ...