Obs. : 2016-09-22 Planet Ly alpha (photons/cm^2/sec) Mercury 4.221e+11 Venus 4.091e+11 Earth 4.013e+11 Mars 4.095e+11 Jupiter 4.128e+11 Saturn 4.082e+11 Uranus 4.013e+11 Neptune 4.079e+11 Pluto 4.102e+11