Obs. : 2015-08-05 Planet Ly alpha (photons/cm^2/sec) Mercury 4.054e+11 Venus 4.142e+11 Earth 4.480e+11 Mars 4.070e+11 Jupiter 4.142e+11 Saturn 4.444e+11 Uranus 4.468e+11 Neptune 4.488e+11 Pluto 4.460e+11