Obs. : 2014-11-27 Planet Ly alpha (photons/cm^2/sec) Mercury 4.102e+11 Venus 4.182e+11 Earth 4.183e+11 Mars 4.220e+11 Jupiter 4.002e+11 Saturn 4.102e+11 Uranus 4.223e+11 Neptune 4.255e+11 Pluto 4.221e+11