Obs. : 2011-05-03 Planet Ly alpha (photons/cm^2/sec) Mercury 4.177e+11 Venus 4.177e+11 Earth 4.283e+11 Mars 4.177e+11 Jupiter 4.177e+11 Saturn 4.285e+11 Uranus 4.273e+11 Neptune 4.263e+11 Pluto 4.253e+11