By contrast, Deimos is tiny, with a radius of 6 km, and quite a bit further out, more than 23,000 km from the surface. It is ...

Most large moons are also spherical, but they don’t need to be by definition; Mars’ Deimos and Phobos are two slightly misshapen examples.

"You could pull up Google Earth images of places like Utah, zoom out, and you’d see the similarities to Mars." Though Mars, the Red Planet, is a vast and inhospitable land today, scientists ...

On Mars, which has a thin atmosphere (less than 1% of Earth's) and no ozone layer, about 30% more damaging UV radiation reaches the surface. However, numerical modeling predicts ice and snow ...

NASA's Perseverance rover has spotted a mysterious rock on the Red Planet, which the space agency has named 'Skull Hill'.

A NASA rover taking rock samples on Mars has uncovered a plentiful mineral that was invisible to orbiters studying the Red Planet from space. Scientists say the discovery of siderite, a type of ...

The newly released snapshots cover a variety of wonders — from seasonal changes on Mars to stars sculpting their environment into celestial art. They were selected specifically to commemorate ...

WASHINGTON — A mineral called siderite found abundantly in rock drilled by a NASA rover on the surface of Mars is providing fresh evidence of the planet's warmer and wetter ancient past when it ...

Geologists weigh in on a long-running debate about Mars: Billions of years ago, was the Red Planet warm and wet or cold and dry? Visit ancient Mars -- a surprisingly temperate planet where snow or ...

All evidence points to Mars having had a carbon dioxide-rich atmosphere billions of years ago, but insufficient carbonates in Martian soil challenge this theory. Now, a new study using data from ...