Obs. : 2015-04-06 Planet Ly alpha (photons/cm^2/sec) Mercury 5.247e+11 Venus 5.393e+11 Earth 4.866e+11 Mars 5.371e+11 Jupiter 4.939e+11 Saturn 4.771e+11 Uranus 5.247e+11 Neptune 4.941e+11 Pluto 4.735e+11