Use the Saha equation to determine the fraction of hydrogen atoms that are ionized, NII/Ntotal, at the center of the Sun. Here the temperature is 15.7 million K and the number density of electrons is about ne=6.1×1031 m−3. (Use ZI=2.) Does your result agree with the fact that practically all of the Sun's hydrogen is ionized at the Sun's center? What is the reason for any discrepancy?