Obs. : 2016-07-07 Planet Ly alpha (photons/cm^2/sec) Mercury 3.771e+11 Venus 3.771e+11 Earth 3.929e+11 Mars 4.039e+11 Jupiter 4.117e+11 Saturn 3.974e+11 Uranus 3.796e+11 Neptune 3.802e+11 Pluto 3.909e+11