Obs. : 2018-03-26 Planet Ly alpha (photons/cm^2/sec) Mercury 3.529e+11 Venus 3.509e+11 Earth 3.413e+11 Mars 3.455e+11 Jupiter 3.440e+11 Saturn 3.469e+11 Uranus 3.509e+11 Neptune 3.560e+11 Pluto 3.469e+11