Obs. : 2010-08-08 Planet Ly alpha (photons/cm^2/sec) Mercury 3.627e+11 Venus 3.657e+11 Earth 3.824e+11 Mars 3.657e+11 Jupiter 3.783e+11 Saturn 3.657e+11 Uranus 3.797e+11 Neptune 3.834e+11 Pluto 3.775e+11