Obs. : 2017-05-10 Planet Ly alpha (photons/cm^2/sec) Mercury 3.863e+11 Venus 3.866e+11 Earth 3.684e+11 Mars 3.824e+11 Jupiter 3.610e+11 Saturn 3.707e+11 Uranus 3.863e+11 Neptune 3.845e+11 Pluto 3.736e+11