Obs. : 2024-12-28 Planet Ly alpha (photons/cm^2/sec) Mercury 9.704e+08 Venus 9.808e+08 Earth 1.005e+09 Mars 1.005e+09 Jupiter 1.070e+09 Saturn 1.004e+09 Uranus 1.100e+09 Neptune 1.035e+09 Pluto 9.516e+08