Obs. : 2019-07-26 Planet Ly alpha (photons/cm^2/sec) Mercury 3.331e+11 Venus 3.331e+11 Earth 3.503e+11 Mars 3.340e+11 Jupiter 3.543e+11 Saturn 3.510e+11 Uranus 3.336e+11 Neptune 3.428e+11 Pluto 3.503e+11