Obs. : 2023-11-01 Planet Ly alpha (photons/cm^2/sec) Mercury 8.541e+08 Venus 8.327e+08 Earth 9.416e+08 Mars 8.541e+08 Jupiter 9.444e+08 Saturn 9.307e+08 Uranus 9.444e+08 Neptune 9.392e+08 Pluto 9.202e+08