Obs. : 2018-05-02 Planet Ly alpha (photons/cm^2/sec) Mercury 4.919e+11 Venus 4.830e+11 Earth 4.692e+11 Mars 4.883e+11 Jupiter 4.692e+11 Saturn 4.781e+11 Uranus 4.949e+11 Neptune 4.928e+11 Pluto 4.883e+11