Obs. : 2024-12-20 Planet Ly alpha (photons/cm^2/sec) Mercury 9.102e+08 Venus 8.908e+08 Earth 9.219e+08 Mars 9.257e+08 Jupiter 9.143e+08 Saturn 8.870e+08 Uranus 9.076e+08 Neptune 8.845e+08 Pluto 9.008e+08