火星上的生命痕迹 美国宇航局再次发现新线索

NASA's Mars rover Curiosity has found indication that the planet could have supported life for millions of years.

The rover has found evidence of ancient lakes and wet underground environments that changed billions of years ago on Gale Crater. There may have also been fluid circulating with the kind of chemistry to form minerals for micro-organisms.

The Curiosity rover arrived on Mars four years ago to determine if the planet ever had the ingredients for life.