The Most Mysterious Worlds Near Earth – Gliese 12 b & Gliese 1214 b | Space Documentary In this space documentary, we travel beyond Earth to two nearby enigmas reshaping exoplanet science: Gliese 12 b and Gliese 1214 b. At just over 40 light-years away, Gliese 12 b is Earth-sized, with unfamiliar light, steady gravity, and geologic hints of long-term stability. Farther out, 48 light-years from the Sun, Gliese 1214 b may be an ocean world, where immense pressure and heat could allow radically different chemistry—and perhaps life. This space documentary explores how these planets expand the idea of habitability, challenging what “Earth-like” really means.