Obs. : 2014-01-02 Planet Ly alpha (photons/cm^2/sec) Mercury 3.764e+11 Venus 3.764e+11 Earth 3.911e+11 Mars 4.173e+11 Jupiter 3.918e+11 Saturn 4.216e+11 Uranus 3.726e+11 Neptune 3.648e+11 Pluto 3.840e+11