Obs. : 2016-03-20 Planet Ly alpha (photons/cm^2/sec) Mercury 4.318e+11 Venus 4.353e+11 Earth 4.205e+11 Mars 4.273e+11 Jupiter 4.183e+11 Saturn 4.292e+11 Uranus 4.285e+11 Neptune 4.353e+11 Pluto 4.321e+11