Obs. : 2015-05-05 Planet Ly alpha (photons/cm^2/sec) Mercury 4.892e+11 Venus 4.796e+11 Earth 4.816e+11 Mars 4.961e+11 Jupiter 4.545e+11 Saturn 4.816e+11 Uranus 4.969e+11 Neptune 4.916e+11 Pluto 4.834e+11