I don’t think anyone is sure yet! We’ve found some evidence there might be (for instance, we’ve found frozen water – which might mean there was life on Mars in the past). But we’ve also found evidence there couldn’t possibly be life there – it’s missing a lot of things that Earth has to protect us from cosmic radiation for instance.
It’s a really popular question! David Bowie certainly liked it, anyway.
Who knows? Water has been found there, as Mike has already pointed out, which means that there could be life there or may have been in the past. But if you’re hoping for little green men, I don’t think they’ve been seen yet…
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