Obs. : 2015-08-03 Planet Ly alpha (photons/cm^2/sec) Mercury 4.169e+11 Venus 4.276e+11 Earth 4.512e+11 Mars 4.101e+11 Jupiter 4.276e+11 Saturn 4.475e+11 Uranus 4.360e+11 Neptune 4.472e+11 Pluto 4.512e+11