Obs. : 2018-11-14 Planet Ly alpha (photons/cm^2/sec) Mercury 3.502e+11 Venus 3.476e+11 Earth 3.520e+11 Mars 3.595e+11 Jupiter 3.575e+11 Saturn 3.571e+11 Uranus 3.546e+11 Neptune 3.593e+11 Pluto 3.606e+11