Search for Mars life stymied by contamination threat
A multi-billion-dollar robot dispatched to Mars to search for life must steer clear of promising "hot spots" for fear of spreading microbes from Earth.
Fri Oct 02 2015
Life on Mars hopes fade after rover findings: study
Hopes of finding life on Mars suffered a setback after new findings from NASA's Curiosity rover detected only trace amounts of methane gas.
Thu Sep 19 2013