There's probably no life on Proxima b. But's let's send a probe and take a look there anyway.
Active stars like Proxima Centauri may produce false positives for exoplanet biosignatures. Life not needed to produce atmospheric O2 & O3.
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Need new tech! At New Horizons's speed, it would take about 54,400 years to get there!
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give one example of something other theb life that create enormous amount of atmospheric O2 ?
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Catalytic cycles on water-depleted M dwarf terrestrial planets: https://arxiv.org/abs/1501.06876
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