Obs. : 2016-09-10 Planet Ly alpha (photons/cm^2/sec) Mercury 4.158e+11 Venus 4.134e+11 Earth 4.167e+11 Mars 4.213e+11 Jupiter 4.158e+11 Saturn 4.199e+11 Uranus 4.077e+11 Neptune 4.225e+11 Pluto 4.252e+11