Obs. : 2017-03-07 Planet Ly alpha (photons/cm^2/sec) Mercury 3.807e+11 Venus 3.767e+11 Earth 3.604e+11 Mars 3.728e+11 Jupiter 3.620e+11 Saturn 3.722e+11 Uranus 3.728e+11 Neptune 3.821e+11 Pluto 3.737e+11