Obs. : 2011-07-07 Planet Ly alpha (photons/cm^2/sec) Mercury 4.138e+11 Venus 4.085e+11 Earth 3.953e+11 Mars 4.051e+11 Jupiter 4.057e+11 Saturn 4.258e+11 Uranus 3.975e+11 Neptune 3.920e+11 Pluto 4.011e+11