Obs. : 2013-06-04 Planet Ly alpha (photons/cm^2/sec) Mercury 4.258e+11 Venus 4.258e+11 Earth 4.308e+11 Mars 4.345e+11 Jupiter 4.283e+11 Saturn 4.335e+11 Uranus 4.511e+11 Neptune 4.413e+11 Pluto 4.308e+11