Obs. : 2014-10-16 Planet Ly alpha (photons/cm^2/sec) Mercury 3.807e+11 Venus 3.807e+11 Earth 3.694e+11 Mars 3.744e+11 Jupiter 3.919e+11 Saturn 3.787e+11 Uranus 3.567e+11 Neptune 3.619e+11 Pluto 3.699e+11