Obs. : 2010-11-06 Planet Ly alpha (photons/cm^2/sec) Mercury 3.950e+11 Venus 3.902e+11 Earth 3.866e+11 Mars 3.931e+11 Jupiter 3.903e+11 Saturn 3.890e+11 Uranus 3.903e+11 Neptune 3.910e+11 Pluto 3.897e+11