Obs. : 2013-11-08 Planet Ly alpha (photons/cm^2/sec) Mercury 4.305e+11 Venus 4.035e+11 Earth 4.076e+11 Mars 4.532e+11 Jupiter 4.268e+11 Saturn 4.305e+11 Uranus 4.131e+11 Neptune 4.143e+11 Pluto 4.035e+11