Every day there are people who have allegedly seen UFOs or scientists who think they have discovered life, but has life ever really been discovered on a planet, such as single-celled organisms or something, on another planet?
Answer
No.
Until now, in fact, people have only really searched Mars, but no “real” life has been found there either.
Of course, you can’t just make an “all-life-discoverer machine” that would be guaranteed to recognize all possible life-forms. Searching for life is done with some well thought out experiment, and that experiment will only be able to discover (hopefully) only the life form for which it was made. Suppose you place an experiment on Mars that searches for traces of micro-organisms in the soil, then Martians (if they existed) could, so to speak, just have a big party next to that device without us noticing anything here. . After all, that device is not made to observe partying Martians. You can only find that kind of life you are looking for.
Answered by
prof.dr. Paul Hellings
Department of Mathematics, Fac. IIW, KU Leuven
Old Market 13 3000 Leuven
https://www.kuleuven.be/
.