Obs. : 2011-05-10 Planet Ly alpha (photons/cm^2/sec) Mercury 4.199e+11 Venus 4.199e+11 Earth 4.213e+11 Mars 4.199e+11 Jupiter 4.199e+11 Saturn 4.075e+11 Uranus 4.230e+11 Neptune 4.180e+11 Pluto 4.202e+11