Obs. : 2017-07-10 Planet Ly alpha (photons/cm^2/sec) Mercury 3.656e+11 Venus 3.605e+11 Earth 3.730e+11 Mars 3.610e+11 Jupiter 3.771e+11 Saturn 3.730e+11 Uranus 3.551e+11 Neptune 3.652e+11 Pluto 3.710e+11