Obs. : 2013-03-25 Planet Ly alpha (photons/cm^2/sec) Mercury 4.635e+11 Venus 4.842e+11 Earth 4.024e+11 Mars 4.892e+11 Jupiter 4.466e+11 Saturn 3.956e+11 Uranus 4.892e+11 Neptune 4.593e+11 Pluto 4.074e+11