Obs. : 2017-01-04 Planet Ly alpha (photons/cm^2/sec) Mercury 3.545e+11 Venus 3.518e+11 Earth 3.462e+11 Mars 3.518e+11 Jupiter 3.497e+11 Saturn 3.545e+11 Uranus 3.453e+11 Neptune 3.518e+11 Pluto 3.585e+11