Obs. : 2011-03-24 Planet Ly alpha (photons/cm^2/sec) Mercury 4.491e+11 Venus 3.820e+11 Earth 3.955e+11 Mars 4.199e+11 Jupiter 4.452e+11 Saturn 3.820e+11 Uranus 4.199e+11 Neptune 3.820e+11 Pluto 3.582e+11