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5

There's nothing wrong with asking a question to which the answer is "nobody knows" -- so long as you are willing to accept that the answer is essentially "nobody knows". The only thing we do know is that the probability you are asking about is non-zero because life does exist on the Earth. Some argue that the probability you are asking ...


15

The answer is, it could be non-zero (some would argue it must be non-zero), but since we don't know what the probability of life emerging on Earth was, it is impossible to quantify. This is why this question is normally turned around - if we find life elsewhere in the Solar System (and it is independently developed), then what is the probability that life ...


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