Obs. : 2011-03-14 Planet Ly alpha (photons/cm^2/sec) Mercury 4.148e+11 Venus 4.501e+11 Earth 4.002e+11 Mars 4.451e+11 Jupiter 4.148e+11 Saturn 4.143e+11 Uranus 4.289e+11 Neptune 4.496e+11 Pluto 4.293e+11