Obs. : 2010-06-23 Planet Ly alpha (photons/cm^2/sec) Mercury 3.712e+11 Venus 3.763e+11 Earth 3.780e+11 Mars 3.893e+11 Jupiter 3.702e+11 Saturn 3.926e+11 Uranus 3.702e+11 Neptune 3.739e+11 Pluto 3.800e+11