(1) the solar luminosity has been constant since the Sun formed, and (2) the Sun was initially of uniform composition throughout, estimate how long it would take the Sun to convert all of its original hydrogen into helium. [Hint: Calculate the mass of hydrogen in the sun and then divide it by the rate of hydrogen fusion.

(1) the solar luminosity has been constant since the Sun formed, and (2) the Sun was initially of uniform composition throughout, estimate how long it would take the Sun to convert all of its original hydrogen into helium. [Hint: Calculate the mass of hydrogen in the sun and then divide it by the rate of hydrogen fusion.