Obs. : 2014-10-25 Planet Ly alpha (photons/cm^2/sec) Mercury 4.289e+11 Venus 4.222e+11 Earth 4.393e+11 Mars 4.310e+11 Jupiter 4.333e+11 Saturn 4.239e+11 Uranus 4.574e+11 Neptune 4.626e+11 Pluto 4.409e+11