Obs. : 2017-03-04 Planet Ly alpha (photons/cm^2/sec) Mercury 3.359e+11 Venus 3.326e+11 Earth 3.230e+11 Mars 3.301e+11 Jupiter 3.266e+11 Saturn 3.282e+11 Uranus 3.301e+11 Neptune 3.359e+11 Pluto 3.292e+11