Obs. : 2014-10-11 Planet Ly alpha (photons/cm^2/sec) Mercury 4.244e+11 Venus 4.246e+11 Earth 3.783e+11 Mars 4.197e+11 Jupiter 4.188e+11 Saturn 4.204e+11 Uranus 3.895e+11 Neptune 4.060e+11 Pluto 4.201e+11