Obs. : 2014-11-30 Planet Ly alpha (photons/cm^2/sec) Mercury 4.263e+11 Venus 4.237e+11 Earth 4.098e+11 Mars 4.274e+11 Jupiter 3.943e+11 Saturn 4.263e+11 Uranus 4.244e+11 Neptune 4.241e+11 Pluto 4.259e+11