Obs. : 2013-01-22 Planet Ly alpha (photons/cm^2/sec) Mercury 4.374e+11 Venus 4.336e+11 Earth 4.121e+11 Mars 4.254e+11 Jupiter 4.081e+11 Saturn 3.927e+11 Uranus 4.147e+11 Neptune 4.254e+11 Pluto 4.336e+11