Nasa used the robot's instruments to analyse the rock, receiving data that indicated it was pure sulphur. Scientists were "stunned", said Nasa when it revealed the discovery last week.

This is the first instance of finding sulphur on the Red Planet in its pure, elemental form. Although scientists previously suspected that the surface of Mars was dotted with sulphuric rocks ...

The efforts made by humans to learn as much as possible about Mars are numerous, and NASA has an indispensable ally on the ...