they're finding a lot of other organics on mars, and some of the moons of jupiter/saturn that may suggest some form of biological activity. you need a lot of evidence to call this kind of stuff though. in lieu of actually getting samples of the microbes or whatever they may be, and demonstrating that they are not from here, you need to demonstrate that simple geologic processes and/or UV are unlikely make what you're seeing.
this is only in our neighbourhood, though. time will tell.






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