Obs. : 2016-03-16 Planet Ly alpha (photons/cm^2/sec) Mercury 4.407e+11 Venus 4.376e+11 Earth 4.230e+11 Mars 4.248e+11 Jupiter 4.189e+11 Saturn 4.269e+11 Uranus 4.412e+11 Neptune 4.376e+11 Pluto 4.285e+11