Obs. : 2015-03-24 Planet Ly alpha (photons/cm^2/sec) Mercury 4.763e+11 Venus 4.623e+11 Earth 5.146e+11 Mars 4.692e+11 Jupiter 4.716e+11 Saturn 5.011e+11 Uranus 4.737e+11 Neptune 4.785e+11 Pluto 4.801e+11