Obs. : 2017-03-13 Planet Ly alpha (photons/cm^2/sec) Mercury 3.717e+11 Venus 3.676e+11 Earth 3.639e+11 Mars 3.606e+11 Jupiter 3.639e+11 Saturn 3.721e+11 Uranus 3.676e+11 Neptune 3.781e+11 Pluto 3.729e+11