Obs. : 2016-02-06 Planet Ly alpha (photons/cm^2/sec) Mercury 4.222e+11 Venus 4.198e+11 Earth 4.583e+11 Mars 4.359e+11 Jupiter 4.566e+11 Saturn 4.221e+11 Uranus 4.332e+11 Neptune 4.298e+11 Pluto 4.198e+11