Obs. : 2017-03-01 Planet Ly alpha (photons/cm^2/sec) Mercury 3.551e+11 Venus 3.555e+11 Earth 3.531e+11 Mars 3.555e+11 Jupiter 3.547e+11 Saturn 3.515e+11 Uranus 3.555e+11 Neptune 3.551e+11 Pluto 3.516e+11