Obs. : 2016-08-07 Planet Ly alpha (photons/cm^2/sec) Mercury 3.804e+11 Venus 3.804e+11 Earth 4.042e+11 Mars 4.132e+11 Jupiter 3.892e+11 Saturn 4.132e+11 Uranus 3.883e+11 Neptune 3.950e+11 Pluto 4.072e+11