Question: how many planets have been discovered on the kepler's second mission as of 2017?
Answer: Including potential planets, the total count stood at 4,034. Kepler also came through on its mission to find a planet approximately the size of Earth in the habitable region of a star. The exoplanet, dubbed Kepler-69c, is about 2,700 light-years away and has a diameter about 1.5 times that of Earth.