  Detections of massive extrasolar moons are shown feasible with the Kepler
space telescope. Kepler's findings of about 50 exoplanets in the stellar
habitable zone naturally make us wonder about the habitability of their
hypothetical moons. Illumination from the planet, eclipses, tidal heating, and
tidal locking distinguish remote characterization of exomoons from that of
exoplanets. We show how evaluation of an exomoon's habitability is possible
based on the parameters accessible by current and near-future technology.
