Obs. : 2016-10-15 Planet Ly alpha (photons/cm^2/sec) Mercury 3.965e+11 Venus 4.098e+11 Earth 3.900e+11 Mars 4.042e+11 Jupiter 3.925e+11 Saturn 4.084e+11 Uranus 3.900e+11 Neptune 3.957e+11 Pluto 4.042e+11