Obs. : 2016-11-17 Planet Ly alpha (photons/cm^2/sec) Mercury 3.610e+11 Venus 3.597e+11 Earth 3.739e+11 Mars 3.621e+11 Jupiter 3.895e+11 Saturn 3.610e+11 Uranus 3.736e+11 Neptune 3.707e+11 Pluto 3.597e+11