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.

The Phobos Incident, Monoliths, and Ancient Ruins At the height of the space race in the late 1970s, the Viking probes successfully landed on Mars – collecting pictures, data, and samples from the red ...

"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 ...

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 ...

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 ...

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 ...

On Earth and Mars, iron and magnesium are some of the main contributors to igneous rocks, which form from the cooling of magma or lava,' the space agency said. 'These rocks can include dark ...

Perhaps the best known of all comets is Halley, correctly pronounced so that it rhymes with rally, not daily. It is named after the 17th-18th century astronomer Edmond Halley. This ...