Obs. : 2011-11-19 Planet Ly alpha (photons/cm^2/sec) Mercury 4.545e+11 Venus 4.545e+11 Earth 4.619e+11 Mars 4.867e+11 Jupiter 4.572e+11 Saturn 4.913e+11 Uranus 4.521e+11 Neptune 4.419e+11 Pluto 4.475e+11