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NASA scientists say there may have been life on Mars

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NASA scientists say there may have been life on Mars

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NASA scientists say an enormous crater on the planet once harboured an ancient lake that could have supported microbial life.

The freshwater lake existed for more than 100,000 years at the base of the Gale crater, a 144-kilometer-wide formation created when a meteor hit the planet about 3.7 billion years ago.