Obs. : 2010-06-11 Planet Ly alpha (photons/cm^2/sec) Mercury 3.790e+11 Venus 3.805e+11 Earth 3.643e+11 Mars 3.874e+11 Jupiter 3.729e+11 Saturn 3.865e+11 Uranus 3.729e+11 Neptune 3.660e+11 Pluto 3.657e+11