Obs. : 2014-09-23 Planet Ly alpha (photons/cm^2/sec) Mercury 4.207e+11 Venus 4.282e+11 Earth 4.147e+11 Mars 4.084e+11 Jupiter 4.353e+11 Saturn 4.149e+11 Uranus 4.147e+11 Neptune 4.088e+11 Pluto 4.022e+11