Obs. : 2008-04-20 Planet Ly alpha Mercury 3.643e+11 Venus 3.570e+11 Earth 3.738e+11 Mars 3.841e+11 Jupiter 3.462e+11 Saturn 3.821e+11 Uranus 3.515e+11 Neptune 3.417e+11 Pluto 3.524e+11