Obs. : 2016-06-27 Planet Ly alpha (photons/cm^2/sec) Mercury 3.946e+11 Venus 3.913e+11 Earth 3.890e+11 Mars 3.926e+11 Jupiter 3.913e+11 Saturn 3.890e+11 Uranus 3.909e+11 Neptune 3.743e+11 Pluto 3.832e+11