Obs. : 2017-08-08 Planet Ly alpha (photons/cm^2/sec) Mercury 3.493e+11 Venus 3.586e+11 Earth 3.785e+11 Mars 3.530e+11 Jupiter 3.635e+11 Saturn 3.759e+11 Uranus 3.703e+11 Neptune 3.766e+11 Pluto 3.778e+11