Obs. : 2014-10-24 Planet Ly alpha (photons/cm^2/sec) Mercury 4.320e+11 Venus 4.201e+11 Earth 4.496e+11 Mars 4.235e+11 Jupiter 4.378e+11 Saturn 4.205e+11 Uranus 4.666e+11 Neptune 4.677e+11 Pluto 4.322e+11