Obs. : 2012-03-14 Planet Ly alpha (photons/cm^2/sec) Mercury 4.354e+11 Venus 4.265e+11 Earth 4.162e+11 Mars 4.162e+11 Jupiter 4.325e+11 Saturn 4.116e+11 Uranus 4.354e+11 Neptune 4.188e+11 Pluto 4.127e+11