Obs. : 2015-03-08 Planet Ly alpha (photons/cm^2/sec) Mercury 4.814e+11 Venus 4.484e+11 Earth 4.865e+11 Mars 4.601e+11 Jupiter 4.663e+11 Saturn 4.732e+11 Uranus 4.601e+11 Neptune 4.784e+11 Pluto 4.747e+11