Obs. : 2011-11-11 Planet Ly alpha (photons/cm^2/sec) Mercury 4.484e+11 Venus 4.484e+11 Earth 4.910e+11 Mars 4.694e+11 Jupiter 4.692e+11 Saturn 4.314e+11 Uranus 4.648e+11 Neptune 4.626e+11 Pluto 4.607e+11