Obs. : 2017-02-26 Planet Ly alpha (photons/cm^2/sec) Mercury 5.102e+11 Venus 5.107e+11 Earth 5.374e+11 Mars 5.107e+11 Jupiter 5.332e+11 Saturn 5.067e+11 Uranus 5.107e+11 Neptune 5.108e+11 Pluto 5.081e+11