Obs. : 2016-10-19 Planet Ly alpha (photons/cm^2/sec) Mercury 4.212e+11 Venus 4.067e+11 Earth 3.890e+11 Mars 4.020e+11 Jupiter 4.204e+11 Saturn 4.025e+11 Uranus 3.935e+11 Neptune 4.021e+11 Pluto 4.020e+11