Obs. : 2016-08-02 Planet Ly alpha (photons/cm^2/sec) Mercury 3.916e+11 Venus 3.916e+11 Earth 3.825e+11 Mars 3.883e+11 Jupiter 3.973e+11 Saturn 3.883e+11 Uranus 3.637e+11 Neptune 3.719e+11 Pluto 3.825e+11