Obs. : 2016-08-21 Planet Ly alpha (photons/cm^2/sec) Mercury 3.756e+11 Venus 3.756e+11 Earth 3.818e+11 Mars 3.882e+11 Jupiter 3.756e+11 Saturn 3.882e+11 Uranus 3.845e+11 Neptune 3.810e+11 Pluto 3.851e+11