Obs. : 2015-04-24 Planet Ly alpha (photons/cm^2/sec) Mercury 4.848e+11 Venus 4.941e+11 Earth 4.984e+11 Mars 4.806e+11 Jupiter 5.201e+11 Saturn 4.984e+11 Uranus 4.794e+11 Neptune 4.777e+11 Pluto 4.795e+11