Obs. : 2014-06-11 Planet Ly alpha (photons/cm^2/sec) Mercury 3.793e+11 Venus 3.786e+11 Earth 4.267e+11 Mars 4.251e+11 Jupiter 3.872e+11 Saturn 4.282e+11 Uranus 3.956e+11 Neptune 4.087e+11 Pluto 4.177e+11