Obs. : 2015-06-21 Planet Ly alpha (photons/cm^2/sec) Mercury 4.838e+11 Venus 4.700e+11 Earth 4.417e+11 Mars 4.840e+11 Jupiter 4.700e+11 Saturn 4.384e+11 Uranus 4.715e+11 Neptune 4.545e+11 Pluto 4.472e+11