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Just because we are now aware of a planet that might be suitable for alien life, the probability that there is alien life has not changed. Whether we are aware of it or not does not affect the chance of it existing! The planet exists whether we know about it or not.....
What I meant was the the probability of those planets existing has not changed, just OUR perception of whether they existed or not has changed. OUR CALCULATION of the probability of life existing may be changed, but the actual probability has not. Either life exists on other planets or it doesn't. Nothing that we learn or do will change that.