Michael Myer
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Mars rover Curiosity sees key water indicator

The US space agency (Nasa) has reported that its Curiosity rover has made another significant discovery on Mars.

The robot has drilled into a rock that contains clay minerals - an indication of formation in, or substantial alteration by, neutral water.

Michael Myer, lead scientist for Nasa's Mars exploration programme, said it was another step towards showing conditions could have once supported life.

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