Obs. : 2024-12-26 Planet Ly alpha (photons/cm^2/sec) Mercury 9.864e+08 Venus 9.526e+08 Earth 1.026e+09 Mars 1.026e+09 Jupiter 1.059e+09 Saturn 9.599e+08 Uranus 1.075e+09 Neptune 9.773e+08 Pluto 9.668e+08