Obs. : 2014-10-05 Planet Ly alpha (photons/cm^2/sec) Mercury 4.019e+11 Venus 3.919e+11 Earth 3.903e+11 Mars 4.139e+11 Jupiter 3.776e+11 Saturn 4.085e+11 Uranus 3.946e+11 Neptune 4.010e+11 Pluto 4.089e+11