Obs. : 2014-09-05 Planet Ly alpha (photons/cm^2/sec) Mercury 3.903e+11 Venus 3.954e+11 Earth 3.860e+11 Mars 3.957e+11 Jupiter 4.007e+11 Saturn 3.957e+11 Uranus 3.871e+11 Neptune 3.860e+11 Pluto 3.928e+11