Of course the big question is whether these planets have ample water on their surface. That would depend critically on just how massive they are. While we have a good idea of their size, we aren#8217;t as certain about their masses. So we#8217;ll need more data to determine if life could survive on these nearby worlds.
Paper: A. C. Barr, et al. Interior structures and tidal heating in the TRAPPIST-1 planets. Astronomy amp; Astrophysics (2018)
In astronomy, #8220;potentially habitable#8221; simply means that the orbit of an exoplanet places it in a particular range of distance from its star. Close enough that its water wouldn#8217;t deep freeze into a perpetual solid, and far enough away that its water doesn#8217;t boil away leaving a dry husk of a world. Earth, as you would expect, lies within the habitable zone of the Sun.
NASA/R. Hurt/T. Pyle