Obs. : 2016-05-01 Planet Ly alpha (photons/cm^2/sec) Mercury 4.090e+11 Venus 4.125e+11 Earth 4.261e+11 Mars 4.261e+11 Jupiter 4.106e+11 Saturn 4.275e+11 Uranus 4.124e+11 Neptune 4.123e+11 Pluto 4.243e+11