Obs. : 2016-02-24 Planet Ly alpha (photons/cm^2/sec) Mercury 4.085e+11 Venus 4.085e+11 Earth 3.987e+11 Mars 3.872e+11 Jupiter 3.946e+11 Saturn 3.881e+11 Uranus 4.335e+11 Neptune 4.362e+11 Pluto 3.932e+11