Obs. : 2016-04-16 Planet Ly alpha (photons/cm^2/sec) Mercury 4.213e+11 Venus 4.225e+11 Earth 4.126e+11 Mars 4.088e+11 Jupiter 4.219e+11 Saturn 4.065e+11 Uranus 4.225e+11 Neptune 4.157e+11 Pluto 4.057e+11