Obs. : 2016-01-18 Planet Ly alpha (photons/cm^2/sec) Mercury 4.262e+11 Venus 4.271e+11 Earth 4.155e+11 Mars 4.191e+11 Jupiter 4.187e+11 Saturn 4.242e+11 Uranus 4.112e+11 Neptune 4.152e+11 Pluto 4.262e+11