All evidence points to Mars having had a carbon dioxide-rich atmosphere billions of years ago, but insufficient carbonates in Martian soil challenge this theory. Now, a new study using data from ...

NASA’s MAVEN spacecraft, which has been orbiting Mars since 2014, is experiencing an unprecedented communication failure. The spacecraft, critical to understanding the Martian atmosphere, lost contact ...

Mars was once rich with flowing water. Today, it's a cold, dusty desert marked by dried riverbeds and empty lake basins. Traces of ancient streams wind across its surface, hinting at a time when water ...