A NASA satellite has spotted frozen "kidney beans" on Mars' sand dunes trapped in place until springtime. Photographing them ...

When Mars tilts sufficiently, carbon dioxide ice sublimates into gas on a large scale, leading to a thicker atmosphere for ...

NASA has arrived at two ways of returning samples collected on Mars to Earth. Now, the agency will test the options to see if ...

NASA’s Curiosity rover is skygazing and photographing lovely examples of noctilucent clouds on Mars. The wispy formations ...

Every 26 months, the orbits of Earth and Mars allow us a closer look when Mars is at opposition — which will happen on Jan.

We're hurtling toward a new era of mega-rockets with enough power to send colonists to the red planet, but should we?

Researchers have discovered two sets of ancient wave ripples on Mars, signatures of long-dried bodies of water preserved in the rock record. Wave ...

A new study may solve a central mystery of the planet’s 4.6-billion-year history. Despite increasing evidence that water flowed on Mars billions of years ago, scientists have been mystified by ...

The ground on Mars is full of nitrogen, a vital component for planet life, raising hopes that it might be more hospitable ...

There is water on Mars locked in icecaps and frozen underground, but there is no liquid water even though daytime ...

The spacecraft compiled the most complete map of the chemical composition of Mars’ atmosphere, observed the planet’s moons Phobos and Deimos in detail, and traced the history of water across ...