It's life Jim, but not as we know it.
Asked by: Mark Pitkin, London
That depends on what you mean by life. If you mean 'life as we know it', the best bet is Mars as it’s the most Earth-like of the other planets.
But even the Earth is home to so-called extremophiles – organisms that can cope with extraordinary temperatures or radiation – so we shouldn’t be surprised if life exists elsewhere in the Solar System.
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