Obs. : 2014-01-14 Planet Ly alpha (photons/cm^2/sec) Mercury 4.053e+11 Venus 4.062e+11 Earth 4.026e+11 Mars 4.416e+11 Jupiter 4.087e+11 Saturn 4.225e+11 Uranus 3.961e+11 Neptune 4.053e+11 Pluto 4.062e+11