Obs. : 2015-09-26 Planet Ly alpha (photons/cm^2/sec) Mercury 4.280e+11 Venus 4.283e+11 Earth 4.499e+11 Mars 4.283e+11 Jupiter 4.253e+11 Saturn 4.477e+11 Uranus 4.499e+11 Neptune 4.652e+11 Pluto 4.654e+11