Obs. : 2013-11-25 Planet Ly alpha (photons/cm^2/sec) Mercury 4.041e+11 Venus 4.254e+11 Earth 3.735e+11 Mars 3.959e+11 Jupiter 3.759e+11 Saturn 4.041e+11 Uranus 4.009e+11 Neptune 4.236e+11 Pluto 4.254e+11