Obs. : 2014-08-07 Planet Ly alpha (photons/cm^2/sec) Mercury 3.470e+11 Venus 3.616e+11 Earth 3.615e+11 Mars 3.235e+11 Jupiter 3.470e+11 Saturn 3.287e+11 Uranus 3.868e+11 Neptune 3.686e+11 Pluto 3.532e+11