8 December 2011 Last updated at 10:40 ET
Jonathan Amos Article written by Jonathan Amos Science correspondent

Nasa's evergreen Mars rover Opportunity keeps on rolling

Creaking and arthritic it may be, but Nasa's Mars rover Opportunity continues to deliver remarkable science.

The near-eight-year-old mobile geologist has just found slivers of a bright material that looks very much like it is gypsum (hydrated calcium sulphate).

If confirmed, it would be the most unambiguous signal of water activity yet found on Mars by this mission which manages to keep on rolling.

Here's my interview with lead scientist on the mission Steve Squyres.

Jonathan Amos Article written by Jonathan Amos Jonathan Amos Science correspondent

MSL - the biggest and best Mars mission

17:09 UK time, Thursday, 24 November 2011

The scale of Nasa's new Mars rover dwarfs all previous roving missions to the surface of the Red Planet.

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