Professor Sanjeev Gupta presents a Nasa video report on the rover's latest observations.

Nasa's Curiosity rover has captured photographs of rounded pebbles which suggest the past existence of an ancient riverbed on the surface of Mars.

Since landing in Gale Crater on 5 August, the six-wheeled mobile laboratory has sent high resolution images of the Martian landscape back to the control team in Pasadena, California, who are looking for evidence of habitability.

Professor Sanjeev Gupta, from the Department of Earth Science and Engineering at Imperial, is one of only two UK scientists taking part in the Mars Science Laboratory mission. In this video from Nasa's Jet Propulsion Laboratory, he reports on the rover’s latest observations.