Methane is such a promising sign for the existence of biological life that it's hard not to get excited when it's detected on Mars. But Amy Shira-Teitel runs down some other ways the gas could be observed on the Red Planet without their being life.
A gas strongly associated with life on Earth has been detected again in the Martian atmosphere, opening a new chapter in a decade-old mystery about the on-again, off-again appearance of methane on Mars.
The motion of water on the bottom of an ancient Martian lake is frozen in time in a stunning new photo by NASA's Curiosity rover.
To account for a lake that lasted for millions of years means the Martian atmosphere would have had to be far thicker and loaded with water.
Here I am on Mars! Dozens of images were combined to create this selfie of Curiosity.
The mountain that NASA's Mars rover Curiosity is exploring appears to have once been a lake.
The Martian landscape is peppered with features that look very alien and often cannot be easily explained.
With today's launch, the spacecraft will reach more than 3,600 miles from Earth — farther than any U.S. spaceship designed for astronauts has been since the end of the Apollo program in 1972.
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