Obs. : 2011-05-16 Planet Ly alpha (photons/cm^2/sec) Mercury 4.080e+11 Venus 4.080e+11 Earth 3.856e+11 Mars 4.080e+11 Jupiter 4.080e+11 Saturn 3.921e+11 Uranus 4.092e+11 Neptune 4.000e+11 Pluto 3.848e+11