Obs. : 2016-05-12 Planet Ly alpha (photons/cm^2/sec) Mercury 4.123e+11 Venus 4.123e+11 Earth 4.079e+11 Mars 4.079e+11 Jupiter 4.055e+11 Saturn 4.071e+11 Uranus 4.086e+11 Neptune 4.046e+11 Pluto 4.065e+11