Obs. : 2014-11-19 Planet Ly alpha (photons/cm^2/sec) Mercury 4.082e+11 Venus 4.069e+11 Earth 4.367e+11 Mars 4.084e+11 Jupiter 4.164e+11 Saturn 4.082e+11 Uranus 4.511e+11 Neptune 4.374e+11 Pluto 4.083e+11