The Cassini spacecraft is set to make a final ultra-close flyby of Enceladus, the brilliant white moon of Saturn, and 'taste' the water it is spewing into space.

Authors of a study on lion populations believe many are in rapid decline and the animal should now be classified as endangered in parts of Africa.

The Rosetta spacecraft discovers molecular oxygen in the cloud of gas surrounding Comet 67P prompting a rethink on the origins of the Solar System.