Obs. : 2015-10-23 Planet Ly alpha (photons/cm^2/sec) Mercury 4.293e+11 Venus 4.316e+11 Earth 4.715e+11 Mars 4.302e+11 Jupiter 4.302e+11 Saturn 4.514e+11 Uranus 4.935e+11 Neptune 4.981e+11 Pluto 4.715e+11