Obs. : 2016-12-03 Planet Ly alpha (photons/cm^2/sec) Mercury 3.613e+11 Venus 3.673e+11 Earth 3.613e+11 Mars 3.654e+11 Jupiter 3.597e+11 Saturn 3.576e+11 Uranus 3.558e+11 Neptune 3.608e+11 Pluto 3.673e+11