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Curiosity rover alters its strategy

The team operating Nasa's Curiosity rover is implementing a new exploration strategy on the Red Planet.

Having established that the ancient environment at the robot's landing site was once habitable for certain types of microbes, the scientists now want to focus on specific questions relating to life.

In particular, the rover is ramping up its hunt for organic (carbon-rich) molecules.

Curiosity project scientist John Grotzinger explained the thinking to our correspondent Jonathan Amos.