Obs. : 2014-03-15 Planet Ly alpha (photons/cm^2/sec) Mercury 4.238e+11 Venus 4.054e+11 Earth 4.070e+11 Mars 4.051e+11 Jupiter 4.158e+11 Saturn 4.024e+11 Uranus 4.416e+11 Neptune 4.238e+11 Pluto 3.995e+11