The 3.7-billion-year-old formations in the planet's Gale Crater suggest the presence of long-gone bodies of liquid water, with no ice covering the surface ...
Images of Mars taken from orbit show thousands of mounds in a region sculpted by water billions of years ago. A robotic mission may investigate the area one day.
On Jan. 25, 2004, NASA’s Opportunity rover landed on Mars and sent its first pictures of the planet to Earth; originally planned as a 90-day mission, the rover remained operational for over 15 years, ...