Obs. : 2017-06-06 Planet Ly alpha (photons/cm^2/sec) Mercury 3.214e+11 Venus 3.184e+11 Earth 3.244e+11 Mars 3.259e+11 Jupiter 3.284e+11 Saturn 3.222e+11 Uranus 3.184e+11 Neptune 3.183e+11 Pluto 3.218e+11