Obs. : 2014-06-18 Planet Ly alpha (photons/cm^2/sec) Mercury 4.221e+11 Venus 3.813e+11 Earth 3.951e+11 Mars 3.989e+11 Jupiter 4.328e+11 Saturn 3.939e+11 Uranus 3.611e+11 Neptune 3.711e+11 Pluto 3.909e+11