Obs. : 2014-06-10 Planet Ly alpha (photons/cm^2/sec) Mercury 3.800e+11 Venus 3.826e+11 Earth 4.262e+11 Mars 4.174e+11 Jupiter 3.831e+11 Saturn 4.212e+11 Uranus 3.988e+11 Neptune 4.112e+11 Pluto 4.209e+11