Obs. : 2013-07-01 Planet Ly alpha (photons/cm^2/sec) Mercury 4.261e+11 Venus 4.257e+11 Earth 4.183e+11 Mars 4.322e+11 Jupiter 4.287e+11 Saturn 4.327e+11 Uranus 4.427e+11 Neptune 4.216e+11 Pluto 4.183e+11