Obs. : 2011-06-13 Planet Ly alpha (photons/cm^2/sec) Mercury 4.189e+11 Venus 4.191e+11 Earth 3.993e+11 Mars 4.191e+11 Jupiter 4.247e+11 Saturn 4.254e+11 Uranus 4.168e+11 Neptune 4.065e+11 Pluto 3.989e+11