Obs. : 2014-11-02 Planet Ly alpha (photons/cm^2/sec) Mercury 4.416e+11 Venus 4.454e+11 Earth 4.031e+11 Mars 4.333e+11 Jupiter 4.184e+11 Saturn 4.454e+11 Uranus 4.149e+11 Neptune 4.184e+11 Pluto 4.288e+11