Obs. : 2015-11-04 Planet Ly alpha (photons/cm^2/sec) Mercury 4.789e+11 Venus 4.775e+11 Earth 4.158e+11 Mars 4.775e+11 Jupiter 4.775e+11 Saturn 4.611e+11 Uranus 4.177e+11 Neptune 4.234e+11 Pluto 4.351e+11