Obs. : 2013-10-25 Planet Ly alpha (photons/cm^2/sec) Mercury 4.085e+11 Venus 4.063e+11 Earth 4.179e+11 Mars 4.061e+11 Jupiter 4.122e+11 Saturn 4.085e+11 Uranus 4.009e+11 Neptune 3.911e+11 Pluto 4.022e+11