Obs. : 2011-05-26 Planet Ly alpha (photons/cm^2/sec) Mercury 4.127e+11 Venus 4.127e+11 Earth 4.091e+11 Mars 4.127e+11 Jupiter 4.097e+11 Saturn 4.320e+11 Uranus 3.952e+11 Neptune 3.865e+11 Pluto 4.053e+11