Obs. : 2014-07-12 Planet Ly alpha (photons/cm^2/sec) Mercury 4.501e+11 Venus 4.501e+11 Earth 3.999e+11 Mars 3.753e+11 Jupiter 4.114e+11 Saturn 3.819e+11 Uranus 4.863e+11 Neptune 4.555e+11 Pluto 4.050e+11