A new study shows evidence that ancient Mars probably had an ample supply of chemical energy for microbes to thrive underground.
NASA still hasn't heard from the Opportunity rover, but at least we can see it again.
The weird shapes and colors of the tiny Martian moons Phobos and Deimos have inspired a long-standing debate about their origins.
Today, NASA's Mars Atmosphere and Volatile Evolution (MAVEN) spacecraft celebrates four years in orbit studying the upper atmosphere of the Red Planet and how it interacts with the sun and the solar wind. To mark the occasion, ...