Find it interesting that NASA makes this call based upon location of the planet in the “habitable zone”. IOWs, the intensity of the sunlight being the key factor. Yet other NASA scientists are all wrapped up in “Anthropromorphic Global Warming” and “Greenhouse Gases” which the other guys seem to neglect.
Go figure?
Hey, aren’t there tons of Class M planets out there in the galaxy? They found them on Star Trek. (sarcasm , LOL )
On one old episode, they found a life form which was silicon based, not carbon based.
As far as global warming goes, we don’t know if the aliens on these planets have been using coal fired power plants or driving SUVs. (more sarcasm)
Blame the science writers, they write the sensational crap. The science itself suggests that its in what we consider to be the habitable zone where all the water doesn’t freeze or boil away.