Obs. : 2016-10-22 Planet Ly alpha (photons/cm^2/sec) Mercury 3.962e+11 Venus 3.839e+11 Earth 3.713e+11 Mars 3.849e+11 Jupiter 4.014e+11 Saturn 3.839e+11 Uranus 3.723e+11 Neptune 3.816e+11 Pluto 3.844e+11