Obs. : 2016-03-08 Planet Ly alpha (photons/cm^2/sec) Mercury 2.168e+11 Venus 2.170e+11 Earth 2.265e+11 Mars 2.229e+11 Jupiter 2.247e+11 Saturn 2.217e+11 Uranus 2.136e+11 Neptune 2.168e+11 Pluto 2.184e+11