John Grunsfeld has a model of the Hubble Space Telescope on his bookshelf. It's right next to a model of a NASA space shuttle, which delivered Hubble to space 35 years ago, and it's no secret why both ...

A rock containing many smaller round stones could indicate that there was once a large amount of liquid water on the Red ...

The Curiosity rover was captured trundling alone in the Martian landscape in the incredible image which sees the machine ...