Obs. : 2014-11-29 Planet Ly alpha (photons/cm^2/sec) Mercury 4.309e+11 Venus 4.313e+11 Earth 4.241e+11 Mars 4.358e+11 Jupiter 4.052e+11 Saturn 4.309e+11 Uranus 4.353e+11 Neptune 4.359e+11 Pluto 4.323e+11