Obs. : 2014-01-15 Planet Ly alpha (photons/cm^2/sec) Mercury 4.012e+11 Venus 4.000e+11 Earth 3.927e+11 Mars 4.315e+11 Jupiter 3.966e+11 Saturn 4.184e+11 Uranus 3.968e+11 Neptune 4.009e+11 Pluto 4.000e+11