Obs. : 2016-04-14 Planet Ly alpha (photons/cm^2/sec) Mercury 4.209e+11 Venus 4.208e+11 Earth 4.251e+11 Mars 4.210e+11 Jupiter 4.270e+11 Saturn 4.186e+11 Uranus 4.208e+11 Neptune 4.184e+11 Pluto 4.117e+11