Obs. : 2014-11-12 Planet Ly alpha (photons/cm^2/sec) Mercury 4.162e+11 Venus 4.077e+11 Earth 4.360e+11 Mars 4.008e+11 Jupiter 4.428e+11 Saturn 4.077e+11 Uranus 4.100e+11 Neptune 4.017e+11 Pluto 4.008e+11