Obs. : 2014-01-28 Planet Ly alpha (photons/cm^2/sec) Mercury 4.205e+11 Venus 4.013e+11 Earth 4.226e+11 Mars 4.157e+11 Jupiter 4.226e+11 Saturn 4.123e+11 Uranus 4.399e+11 Neptune 4.205e+11 Pluto 4.013e+11