The current hopes are pinned on Proxima-b, despite the radiation from red dwarf star Proxima Centauri, 4.24 light years from Earth:
Most researchers consider the presence of liquid water essential to the development of life, so Proxima-b seems like a good candidate. However, the radiation from being so close to a red dwarf would make it inhospitable to us even if there’s water. The radiation might not be a deal-breaker for the development of alien life on Proxima-b, though. Lisa Kaltenegger and Jack O’Malley-James from Cornell modeled the surface ultraviolet radiation on four prominent exoplanets: Proxima-b, TRAPPIST-1e, Ross-128b, and LHS-1140b. It turns out, Proxima-b isn’t that bad compared with Earth’s past.Ryan Whitwam, “Life May Be Evolving on the Closest Alien Planet to Earth” at ExtremeTech
The fundamental problem is still the same: It is very difficult to extrapolate from a sample of one instance of life. Suppose we had information on tens of thousands of exoplanets, thousands of which had
Also, we must be prepared to accept anomalies: What if we have data on tens of thousands of planets and none of them have
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See also: Tales of an invented god (why space aliens will always be out there)