Obs. : 2016-10-11 Planet Ly alpha (photons/cm^2/sec) Mercury 3.812e+11 Venus 3.917e+11 Earth 3.943e+11 Mars 4.076e+11 Jupiter 3.812e+11 Saturn 3.978e+11 Uranus 3.964e+11 Neptune 4.049e+11 Pluto 4.076e+11