TESS's two-year all-sky survey will focus on nearby G-, K-, and M-type stars with apparent magnitudes brighter than magnitude 12.[27] Approximately 500,000 stars will be studied, including the 1,000 closest red dwarfs across the whole sky,[2][28] an area 400 times larger than that covered by the Kepler mission.[6] TESS is expected to discover more than 20,000 transiting exoplanets, including 500 to 1000 Earth-sized planets and super-Earths.[10] Of those discoveries, an estimated 20 could be super-Earths located in the habitable zone around a star.[29] Most exoplanets are expected to be between 30 and 300 light-years away.