NASA just announced 7 rocky planets around the cool red star Trappist-1 – and 3 of those orbit within the Habitable Zone (where surface liquid water would be possible). Exciting discovery. Planets abound – now we’ll have to observe them to see if they are habitats – wouldn’t that be amazing? 3 potentially habitable worlds orbiting the same star.
An interesting open question is whether the UV flux on the surface might be harsh to sterilizing. However if life would evolve, it could always hide underground or in an ocean… (and maybe even generate biofluorescent signatures?)
Exciting times for discoveries!