Obs. : 2016-11-04 Planet Ly alpha (photons/cm^2/sec) Mercury 3.852e+11 Venus 3.841e+11 Earth 3.980e+11 Mars 3.904e+11 Jupiter 3.993e+11 Saturn 3.841e+11 Uranus 4.059e+11 Neptune 4.039e+11 Pluto 3.904e+11