Mars

Migrating silica reveals liquid water lingered longer on Red Planet.

New study reveals how changes in Martian rainfall shaped the planet.

NASA's Mars Exploration Rover Opportunity has reached the main destination of its current two-year extended mission -- an ancient fluid-carved valley incised on the inner slope of a vast crater's rim.

Plumes of vapor generated by ancient impacts on Mars created tornado-like winds possibly swirling at more than 500 miles per hour.

As it drives uphill from a band of rippled sand dunes, NASA's Curiosity Mars rover is toting a fistful of dark sand for onboard analysis that will complete the rover's investigation of those dunes.

Calm before the storm supports late heavy bombardment theory.

Chile's Atacama Desert is the driest non-polar desert on Earth -- and a ready analog for Mars' rugged, arid terrain.

Mineral deposits in a region called Northeast Syrtis Major suggest a plethora of once-habitable environments.

Mars has electrically charged metal atoms high in its atmosphere, according to new results from NASA's MAVEN spacecraft.

Two ancient sites on Mars that hosted an abundance of water in the planet’s early history have been recommended as the final candidates for the landing site of the 2020 ExoMars rover.