Obs. : 2016-07-01 Planet Ly alpha (photons/cm^2/sec) Mercury 3.908e+11 Venus 3.954e+11 Earth 3.896e+11 Mars 3.906e+11 Jupiter 3.895e+11 Saturn 3.907e+11 Uranus 3.772e+11 Neptune 3.744e+11 Pluto 3.834e+11