Obs. : 2013-11-03 Planet Ly alpha (photons/cm^2/sec) Mercury 4.541e+11 Venus 4.374e+11 Earth 4.194e+11 Mars 4.298e+11 Jupiter 4.194e+11 Saturn 4.597e+11 Uranus 4.213e+11 Neptune 4.208e+11 Pluto 4.374e+11