Add in my recent conjecture for a habitable hollow planet as standard and we have a completely new standard for a life bearing planet. Essentially all of them. Amusingly this make Swedenborg's information regarding life on all planets as effectively correct. I had considered it as a rare error on his part.
Even without the conjecture of a successful hollow planet, we have simple underground bases to contend with. It happens to be the obvious solution to colonizing a strange planet.
Earth 2.0? Search For Alien Life Continues As Possible Habitable Worlds Spotted Nearby
August 16, 2016
“It was hard work finding the tiny celestial body. We were at the limits of what is technologically possible when it comes to measurements.”
The unnamed exoplanet is .24 light years away from the two stars of Alpha Centauri and is considered part of that system; the constellation is mainly visible from the southern hemisphere.
“Never before have planet-hunters come upon another possible Earth that is so nearby.”
“It’s exciting to see the sheer amount of planets that are out there. [It] makes you think that there is zero chance of there not being another place where life could be found.”
“The discovery of a possible planet around Proxima Centauri is very exciting. It makes the case of visiting nearby stellar systems even more compelling, though we know there are many exoplanets around other nearby stars and it is very likely that the Alpha Centauri system will also have planets.”