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There's water on Mars, but is there life? – video

Mars has captured the popular imagination for hundred of years. But hang on – didn’t Nasa discover evidence of water on the red planet a while ago? So what’s different this time around? And even if we did discover signs of life, space agencies are forbidden from contaminating alien ecosystems, so could we even check it out? Ian Sample explainsNasa scientists find evidence of water on Mars

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