Obs. : 2017-03-20 Planet Ly alpha (photons/cm^2/sec) Mercury 3.597e+11 Venus 3.597e+11 Earth 3.656e+11 Mars 3.539e+11 Jupiter 3.656e+11 Saturn 3.655e+11 Uranus 3.562e+11 Neptune 3.634e+11 Pluto 3.644e+11