tidally locked, and thus would still experience a day/night cycle indefinitely. The possible exomoon candidate transiting 2MASS J1119-1137AB lies in the habitable zone of its host (at least initially until the planet cools), but it is unlikely complex life has formed as the system is only 10 Myr old. If confirmed, the exomoon may be similar to primordial earth and characterization of its atmosphere with the James Webb Space Telescope could perhaps place limits on the time scale for the formation of life. See also Subsatellite, also known as a submoon or moonmoon References External links Shadow Moons: The Unknown Sub-Worlds that Might Harbor Life Likely First Photo of Planet Beyond the Solar System Working Group on Extrasolar Planets – Definition of a "Planet" Position statement on the definition of a planet. (IAU) The Hunt for Exomoons with Kepler (HEK): I. Description of a New Observational Project Moons Hypothetical moons Planetary satellite systems