Obs. : 2016-11-07 Planet Ly alpha (photons/cm^2/sec) Mercury 3.700e+11 Venus 3.731e+11 Earth 3.783e+11 Mars 3.829e+11 Jupiter 3.808e+11 Saturn 3.748e+11 Uranus 3.830e+11 Neptune 3.880e+11 Pluto 3.774e+11