Obs. : 2015-11-26 Planet Ly alpha (photons/cm^2/sec) Mercury 4.561e+11 Venus 4.305e+11 Earth 4.282e+11 Mars 4.232e+11 Jupiter 4.177e+11 Saturn 4.561e+11 Uranus 4.457e+11 Neptune 4.605e+11 Pluto 4.664e+11