Obs. : 2016-01-07 Planet Ly alpha (photons/cm^2/sec) Mercury 4.319e+11 Venus 4.104e+11 Earth 4.357e+11 Mars 4.022e+11 Jupiter 4.143e+11 Saturn 4.104e+11 Uranus 4.317e+11 Neptune 4.344e+11 Pluto 4.234e+11