Obs. : 2009-12-24 Planet Ly alpha (photons/cm^2/sec) Mercury 3.600e+11 Venus 3.590e+11 Earth 3.582e+11 Mars 3.635e+11 Jupiter 3.523e+11 Saturn 3.606e+11 Uranus 3.473e+11 Neptune 3.523e+11 Pluto 3.590e+11