Obs. : 2024-11-25 Planet Ly alpha (photons/cm^2/sec) Mercury 9.222e+08 Venus 9.336e+08 Earth 9.912e+08 Mars 9.603e+08 Jupiter 9.843e+08 Saturn 9.742e+08 Uranus 9.912e+08 Neptune 9.815e+08 Pluto 9.486e+08