Obs. : 2010-10-03 Planet Ly alpha (photons/cm^2/sec) Mercury 3.856e+11 Venus 3.891e+11 Earth 3.664e+11 Mars 3.891e+11 Jupiter 3.688e+11 Saturn 3.856e+11 Uranus 3.688e+11 Neptune 3.662e+11 Pluto 3.799e+11