Obs. : 2015-08-29 Planet Ly alpha (photons/cm^2/sec) Mercury 4.154e+11 Venus 4.010e+11 Earth 4.249e+11 Mars 4.010e+11 Jupiter 4.001e+11 Saturn 4.314e+11 Uranus 4.171e+11 Neptune 4.199e+11 Pluto 4.282e+11