Obs. : 2016-09-04 Planet Ly alpha (photons/cm^2/sec) Mercury 4.130e+11 Venus 4.148e+11 Earth 4.140e+11 Mars 4.050e+11 Jupiter 4.148e+11 Saturn 4.069e+11 Uranus 4.253e+11 Neptune 4.116e+11 Pluto 4.059e+11