Obs. : 2014-10-30 Planet Ly alpha (photons/cm^2/sec) Mercury 4.511e+11 Venus 4.628e+11 Earth 4.240e+11 Mars 4.694e+11 Jupiter 4.329e+11 Saturn 4.665e+11 Uranus 4.370e+11 Neptune 4.546e+11 Pluto 4.668e+11