Obs. : 2018-05-30 Planet Ly alpha (photons/cm^2/sec) Mercury 3.570e+11 Venus 3.586e+11 Earth 3.564e+11 Mars 3.517e+11 Jupiter 3.596e+11 Saturn 3.534e+11 Uranus 3.552e+11 Neptune 3.528e+11 Pluto 3.524e+11