Obs. : 2014-06-04 Planet Ly alpha (photons/cm^2/sec) Mercury 3.785e+11 Venus 3.788e+11 Earth 3.827e+11 Mars 3.369e+11 Jupiter 3.747e+11 Saturn 3.594e+11 Uranus 3.810e+11 Neptune 3.965e+11 Pluto 3.874e+11