Evidence for Life In Other Solar Systems? No but yes.

TL;DR

Multiple exoplanets show plausible biosignatures but data remains inconclusive, yet insiders say evidence is strong enough that official acceptance standards are the only barrier.

Key Points

• 1.K2-18b is the most discussed exoplanet biosignature candidate. Located 124 light-years away, James Webb data showed a 3-sigma detection of dimethyl sulfide — produced almost exclusively by marine microbes on Earth — at concentrations thousands of times higher than on Earth, though independent reanalyses found the data inconclusive.
• 2.TOI-270d offers stronger but still inconclusive biosignature data. Two independent groups detected methane, carbon dioxide, carbon disulfide, and ethane on this planet 73 light-years away, but non-biological sources cannot yet be ruled out.
• 3.The TRAPPIST system is promising but observationally difficult. Only 40 light-years away with three potentially habitable rocky planets, its highly active red dwarf star makes it nearly impossible to confirm whether those planets even have atmospheres; over a dozen James Webb observation runs are scheduled.
• 4.Insiders believe life has effectively been found but proof standards are prohibitively high. An academic astrophysicist in spectroscopy stated there are so many plausible biosignatures that 'there's no longer any real doubt,' and claims that Webb can never reach required significance are seen as leverage to request bigger telescopes.