The car-sized rover Curiosity had a clean landing on Mars five months ago. But planetary missions didn’t always run so smoothly at NASA’s Jet Propulsion Laboratory. Mariner 3, a probe sent to do a ...

There is a lot of evidence from orbiting satellites and surface rovers indicating that liquid water was present long ago on the surface of Mars in the form of ponds, lakes, and rivers. But the idea ...

Skylights, openings in the surface of Mars that descend down into caves, have been found on Mars, along with signatures for the presence of water ice. When you purchase through links on our site, we ...