Obs. : 2016-07-02 Planet Ly alpha (photons/cm^2/sec) Mercury 3.872e+11 Venus 3.947e+11 Earth 3.863e+11 Mars 3.885e+11 Jupiter 3.934e+11 Saturn 3.875e+11 Uranus 3.790e+11 Neptune 3.796e+11 Pluto 3.830e+11