TRAPPIST-1 planet has a life-sustaining atmosphere, possible water, and moderate temperatures, scientists suggest.
A promising super-Earth, 1,200 light-years away, has a rocky nature and receives sufficient sunlight for life.
Super-Earth, 40 light-years away, in habitable zone, likely has thick atmosphere and possible water.
Proxima Centauri b, in the habitable zone, is Earth-sized with potential liquid water, a prime candidate.
K2-18b, discovered in 2015, orbits in the habitable zone, has water vapor, and potentially hosts a thick atmosphere with carbon molecules and ocean.