Mars 'more active than suspected'

New images of Mars suggest the Red Planet's surface is more active than previously thought, the US space agency (Nasa) reports. Photographs from Nasa's orbiting spacecraft Mars Global Surveyor show recently formed craters and gullies. The agency's scientists also say that deposits of frozen carbon dioxide near the planet's south pole have shrunk for three summers in a row.

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http://news.bbc.co.uk/2/hi/science/nature/4266474.stm