Eine andere Erde oder ein Fehler in den Daten? Wir werden es vielleicht nie erfahren

I have yet to see any means that exists or could exist to prove alien life exists

Even stuff that seems like golden tickets like free oxygen is now known to be possible through chemical processes, and as discoveries like that are made in the future they will only make positive detection more and more difficult.

And thats if our instruments even reach a point where we can be certain about what chemicals are there. Right now if you pointed our best instruments at the Earth in another star system its unlikely we’d see much beyond water and nitrogen.