Obs. : 2014-06-25 Planet Ly alpha (photons/cm^2/sec) Mercury 4.129e+11 Venus 4.085e+11 Earth 3.732e+11 Mars 4.216e+11 Jupiter 4.309e+11 Saturn 3.914e+11 Uranus 3.910e+11 Neptune 3.787e+11 Pluto 3.728e+11