Obs. : 2016-09-09 Planet Ly alpha (photons/cm^2/sec) Mercury 4.212e+11 Venus 4.186e+11 Earth 4.210e+11 Mars 4.233e+11 Jupiter 4.212e+11 Saturn 4.185e+11 Uranus 4.137e+11 Neptune 4.257e+11 Pluto 4.256e+11