Obs. : 2025-01-28 Planet Ly alpha (photons/cm^2/sec) Mercury 8.680e+08 Venus 9.413e+08 Earth 8.995e+08 Mars 8.888e+08 Jupiter 9.057e+08 Saturn 9.310e+08 Uranus 9.366e+08 Neptune 9.413e+08 Pluto 8.680e+08