Obs. : 2016-06-15 Planet Ly alpha (photons/cm^2/sec) Mercury 4.100e+11 Venus 4.034e+11 Earth 4.161e+11 Mars 4.187e+11 Jupiter 4.075e+11 Saturn 4.161e+11 Uranus 4.099e+11 Neptune 4.078e+11 Pluto 4.154e+11