Obs. : 2017-05-02 Planet Ly alpha (photons/cm^2/sec) Mercury 3.814e+11 Venus 3.782e+11 Earth 3.710e+11 Mars 3.934e+11 Jupiter 3.708e+11 Saturn 3.694e+11 Uranus 3.814e+11 Neptune 3.743e+11 Pluto 3.710e+11