Obs. : 2014-05-30 Planet Ly alpha (photons/cm^2/sec) Mercury 3.958e+11 Venus 3.908e+11 Earth 3.721e+11 Mars 3.664e+11 Jupiter 3.966e+11 Saturn 3.652e+11 Uranus 3.918e+11 Neptune 3.945e+11 Pluto 3.788e+11