In 2012, the Curiosity rover began its slow trek across the surface of Mars, listening for commands from Earth about where to go, what to photograph, which rocks to inspect. Then last year, something interesting happened: Curiosity started making decisions ...

Ample evidence says ancient Mars was sometimes wet, with water flowing and pooling on the planet’s surface. Yet, the ancient sun was about one-third less warm and could not provide enough heat, Joinfo.com reports with reference to NASA. A leading ...