Obs. : 2014-10-01 Planet Ly alpha (photons/cm^2/sec) Mercury 3.727e+11 Venus 3.603e+11 Earth 3.835e+11 Mars 3.968e+11 Jupiter 3.826e+11 Saturn 3.838e+11 Uranus 3.835e+11 Neptune 3.947e+11 Pluto 3.969e+11