Obs. : 2016-07-03 Planet Ly alpha (photons/cm^2/sec) Mercury 3.828e+11 Venus 3.899e+11 Earth 3.854e+11 Mars 3.887e+11 Jupiter 3.977e+11 Saturn 3.871e+11 Uranus 3.772e+11 Neptune 3.788e+11 Pluto 3.819e+11