Media playback is unsupported on your device

Opportunity rover makes rock discovery

Nasa's ageing Opportunity rover on Mars has just made what may be one of its most significant discoveries to date.

The nine-year-old robot has identified rock laden with what scientists believe to be clay minerals.

Their presence is an indication that the rock, dubbed Esperance, has been altered at some point in the past through prolonged contact with water.

Steve Squyres, the rover's principal investigator, told BBC Newshour about the find and spoke, too, of Opportunity's remarkable longevity.

  • 10 Jun 2013