Obs. : 2016-05-13 Planet Ly alpha (photons/cm^2/sec) Mercury 4.147e+11 Venus 4.147e+11 Earth 4.119e+11 Mars 4.119e+11 Jupiter 4.149e+11 Saturn 4.110e+11 Uranus 4.120e+11 Neptune 4.100e+11 Pluto 4.104e+11