Obs. : 2015-06-19 Planet Ly alpha (photons/cm^2/sec) Mercury 4.820e+11 Venus 4.552e+11 Earth 4.567e+11 Mars 4.734e+11 Jupiter 4.552e+11 Saturn 4.527e+11 Uranus 4.817e+11 Neptune 4.641e+11 Pluto 4.654e+11