Scientists now seem to understand why the gas has been detected at ground level on Mars but not higher up in the air.
The Mars rover Curiosity, also known as the Science Laboratory, will launch in late 2011 and land on the Red Planet in August 2012.
It might look like a postcard from Arizona, but this snapshot shows something much more exotic: the planet Mars, as seen by NASA's Curiosity rover.
NASA's Mars Reconnaissance Orbiter captured a dramatic image last month of Curiosity ascending Mont Mercou, a landform on the slopes of the Red Planet's 3.4-mile-high (5.5 kilometers) Mt. Sharp.
Mars did not dry up all at once, but fluctuated between dry spells and wetter times, a new study finds.
NASA's Mars rover Curiosity posed for a selfie in front of a beautiful Martian rock outcrop called "Mont Mercou" after probing the area for clues about the Red Planet's past.
NASA's Curiosity rover marked 3,000 Martian days, or "sols," on the Red Planet Tuesday (Jan. 12), a mere five weeks before NASA's Perseverance rover is scheduled to touch down.
NASA's Mars rover Curiosity has taken another selfie, just a few months before its six-wheeled cousin joins it on the Red Planet.
NASA's Mars rover Curiosity has spotted a dust devil swirling through the parched Red Planet landscape.
NASA's car-size Curiosity rover celebrates eight years on the Red Planet today (Aug. 5), less than a week after the Perseverance rover took flight toward Mars.
Budget cuts may force NASA's Curiosity rover mission to slam on the brakes just as it's reaching its highly anticipated home stretch.
The Curiosity team just released a 1.8-billion-pixel panorama that features "Glen Torridon," a region on the flanks of Mars' 3.4-mile-high (5.5 kilometers) Mount Sharp.
An attitude problem sidelined NASA's Mars rover Curiosity recently, but the robot's handlers whipped it back into shape in short order.
Curiosity is the last functioning rover on Mars, and its lonely mission has taken the robot to a steep mountain in the middle of a vast crater.
NASA's Curiosity Mars rover performed some rare science work recently, then took a bit of a break to take in the austere beauty of its surroundings.
NASA's Curiosity Mars rover may have just captured a snapshot of the Red Planet's long-ago Great Drying.
Mars mission managers are dealing with the biggest source of electromagnetic interference in the solar system.
It's been seven years since NASA's Curiosity rover touched down on Mars, but the robot geologist is still tackling big questions about Red Planet rocks.