Obs. : 2014-02-07 Planet Ly alpha (photons/cm^2/sec) Mercury 4.117e+11 Venus 4.216e+11 Earth 4.246e+11 Mars 4.571e+11 Jupiter 4.145e+11 Saturn 4.432e+11 Uranus 4.056e+11 Neptune 4.117e+11 Pluto 4.216e+11