Nasa’s Curiosity rover used the Mars Hand Lens Imager  to capture this set of 55 high-resolution images, which were stitched together to create this full-colour self-portrait. Photograph: JPL-Caltech/Malin Space Science Systems/Nasa/Reuters

Analysis of Martian soil by Nasa’s ongoing Mars Curiosity rover has turned up a surprising amount of water, as well as a chemical that will make a sea(...)