Obs. : 2016-06-22 Planet Ly alpha (photons/cm^2/sec) Mercury 3.932e+11 Venus 3.946e+11 Earth 3.862e+11 Mars 3.871e+11 Jupiter 3.967e+11 Saturn 3.862e+11 Uranus 3.955e+11 Neptune 3.900e+11 Pluto 3.846e+11