Obs. : 2010-11-03 Planet Ly alpha (photons/cm^2/sec) Mercury 3.885e+11 Venus 3.849e+11 Earth 3.683e+11 Mars 3.932e+11 Jupiter 3.749e+11 Saturn 3.754e+11 Uranus 3.709e+11 Neptune 3.822e+11 Pluto 3.854e+11