Obs. : 2016-07-13 Planet Ly alpha (photons/cm^2/sec) Mercury 3.974e+11 Venus 3.974e+11 Earth 4.418e+11 Mars 4.358e+11 Jupiter 3.975e+11 Saturn 4.402e+11 Uranus 4.093e+11 Neptune 4.240e+11 Pluto 4.372e+11