Obs. : 2024-05-22 Planet Ly alpha (photons/cm^2/sec) Mercury 9.790e+08 Venus 9.644e+08 Earth 9.322e+08 Mars 1.032e+09 Jupiter 9.644e+08 Saturn 1.053e+09 Uranus 9.644e+08 Neptune 1.053e+09 Pluto 1.011e+09