Obs. : 2015-05-28 Planet Ly alpha (photons/cm^2/sec) Mercury 4.769e+11 Venus 4.702e+11 Earth 4.277e+11 Mars 4.769e+11 Jupiter 4.561e+11 Saturn 4.183e+11 Uranus 4.599e+11 Neptune 4.562e+11 Pluto 4.324e+11