Obs. : 2024-10-07 Planet Ly alpha (photons/cm^2/sec) Mercury 9.366e+08 Venus 9.180e+08 Earth 9.659e+08 Mars 1.048e+09 Jupiter 1.033e+09 Saturn 9.488e+08 Uranus 1.017e+09 Neptune 9.659e+08 Pluto 9.202e+08