Obs. : 2013-07-03 Planet Ly alpha (photons/cm^2/sec) Mercury 4.302e+11 Venus 4.221e+11 Earth 4.289e+11 Mars 4.476e+11 Jupiter 4.399e+11 Saturn 4.328e+11 Uranus 4.386e+11 Neptune 4.270e+11 Pluto 4.289e+11