An academic describes the career high of working on the most successful mission to Mars, and the little rover that made it possible.
Researchers have found evidence of a large lake of salty water, buried 1.5 kilometres beneath the southern polar ice cap on Mars. So what does that mean for life on the red planet?
They erupted for billions of years and make Earth's volcanoes look like molehills. Here's what we know and what we don't know about them.