An important takeaway from the paper is that red dwarf stars, the most common stars (~75%) in the universe, might not be suitable at all for complex life. This is another blow to the habitability of red dwarf stars from multiple approaches.
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We can tell which exoplanets match the different habitability criteria, but due to model and observational uncertainties this is just a general guide to prioritize observations. No way yet to really identify habitable planets.
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If complex life is only limited to a smaller habitable zone around Sun-like stars then, statistically, there is only one Earth-like planet within the Solar Neighborhood (<10 pc). That's just us.
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The more we learn about the universe, the lonelier we feel.
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Isn't this very dependent on the details of organisms that have evolved in a low CO2 environment for 500 million years?
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We acknowledge in the paper that there may be unknown mechanisms for dealing with hypercapnia at very high CO2. If someone discovered this, it would be relevant for the habitability of some exoplanets!
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Ocean creatures live under more than 1 bar. I’m guessing the real limit is the conditions under which the citric cycle is possible.
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