1. When will the Sun exhaust its supply of hydrogen and no longer maintain the same state of hydrostatic equilibrium that exists today? (Assume that the Sun will run out of hydrogen fuel in its core, due to inefficient mixing, after 5% of the Sun's current total hydrogen content is converted into helium.)

1. When will the Sun exhaust its supply of hydrogen and no longer maintain the same state of hydrostatic equilibrium that exists today? (Assume that the Sun will run out of hydrogen fuel in its core, due to inefficient mixing, after 5% of the Sun's current total hydrogen content is converted into helium.)