Obs. : 2014-09-06 Planet Ly alpha (photons/cm^2/sec) Mercury 3.848e+11 Venus 3.873e+11 Earth 3.893e+11 Mars 3.911e+11 Jupiter 3.938e+11 Saturn 3.911e+11 Uranus 3.857e+11 Neptune 3.893e+11 Pluto 3.950e+11