Obs. : 2014-06-29 Planet Ly alpha (photons/cm^2/sec) Mercury 3.702e+11 Venus 3.658e+11 Earth 3.964e+11 Mars 4.408e+11 Jupiter 3.746e+11 Saturn 4.286e+11 Uranus 3.530e+11 Neptune 3.514e+11 Pluto 3.900e+11