Obs. : 2017-01-13 Planet Ly alpha (photons/cm^2/sec) Mercury 3.009e+11 Venus 3.209e+11 Earth 3.084e+11 Mars 3.209e+11 Jupiter 2.972e+11 Saturn 2.967e+11 Uranus 3.138e+11 Neptune 3.209e+11 Pluto 3.087e+11