Obs. : 2013-06-25 Planet Ly alpha (photons/cm^2/sec) Mercury 4.131e+11 Venus 4.131e+11 Earth 4.329e+11 Mars 4.259e+11 Jupiter 4.235e+11 Saturn 4.229e+11 Uranus 4.369e+11 Neptune 4.371e+11 Pluto 4.329e+11