Obs. : 2010-05-22 Planet Ly alpha (photons/cm^2/sec) Mercury 3.795e+11 Venus 3.813e+11 Earth 3.747e+11 Mars 3.921e+11 Jupiter 3.686e+11 Saturn 3.925e+11 Uranus 3.686e+11 Neptune 3.622e+11 Pluto 3.712e+11