Obs. : 2008-12-03 Planet Ly alpha (photons/cm^2/sec) Mercury 3.462e+11 Venus 3.485e+11 Earth 3.490e+11 Mars 3.462e+11 Jupiter 3.485e+11 Saturn 3.452e+11 Uranus 3.471e+11 Neptune 3.473e+11 Pluto 3.479e+11