Obs. : 2016-12-05 Planet Ly alpha (photons/cm^2/sec) Mercury 3.598e+11 Venus 3.598e+11 Earth 3.542e+11 Mars 3.581e+11 Jupiter 3.606e+11 Saturn 3.601e+11 Uranus 3.500e+11 Neptune 3.561e+11 Pluto 3.598e+11