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lughnasadh OP t1_j6o3b8z wrote

>>Why can we expect that?

Because with current efforts it's likely by 2030 hundreds, if not thousands of nearby (100 light years) exoplanets will have had their atmosphere's scanned for biosignatures.

If microbial life is common, then you would expect it to show up at least once per 1,000 planets.

Ground and space telescopes like Spitzer, Kepler, Hubble, TESS, MAUVE and the James Webb Space Telescope are contributing to this search.

As are the TRAPPIST, TOLIMAN, Breakthrough Watch, & SPECULOOS programs.

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