Obs. : 2014-08-10 Planet Ly alpha (photons/cm^2/sec) Mercury 3.895e+11 Venus 4.055e+11 Earth 3.571e+11 Mars 3.392e+11 Jupiter 3.994e+11 Saturn 3.392e+11 Uranus 3.742e+11 Neptune 3.606e+11 Pluto 3.535e+11