Obs. : 2017-04-02 Planet Ly alpha (photons/cm^2/sec) Mercury 8.815e+11 Venus 8.690e+11 Earth 8.383e+11 Mars 8.852e+11 Jupiter 8.445e+11 Saturn 8.369e+11 Uranus 8.714e+11 Neptune 8.598e+11 Pluto 8.446e+11