Obs. : 2014-09-16 Planet Ly alpha (photons/cm^2/sec) Mercury 4.214e+11 Venus 4.137e+11 Earth 3.977e+11 Mars 4.190e+11 Jupiter 4.129e+11 Saturn 4.195e+11 Uranus 4.021e+11 Neptune 3.961e+11 Pluto 4.092e+11