Obs. : 2013-07-10 Planet Ly alpha (photons/cm^2/sec) Mercury 4.303e+11 Venus 4.330e+11 Earth 4.335e+11 Mars 4.299e+11 Jupiter 4.299e+11 Saturn 4.365e+11 Uranus 4.400e+11 Neptune 4.403e+11 Pluto 4.335e+11