Obs. : 2013-05-10 Planet Ly alpha (photons/cm^2/sec) Mercury 4.485e+11 Venus 4.398e+11 Earth 4.346e+11 Mars 4.485e+11 Jupiter 4.320e+11 Saturn 4.350e+11 Uranus 4.660e+11 Neptune 4.685e+11 Pluto 4.453e+11