When the Sun was formed, about 75 percent of its mass was hydrogen, of which only about
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When the Sun was formed, about 75 percent of its mass was hydrogen, of which only about 13 percent ever becomes available for fusion. (The rest is in regions of the Sun where the temperature is too low for fusion reactions to occur.) MΘ = 2 x 1030 kg and the Sun fuses about 6 x 1011 kg/s.
(a) Compute the total mass of hydrogen available for fusion during the Sun’s lifetime.
(b) How long (in years) will the Sun’s initial supply of hydrogen last?
(c) Since the solar system is currently about 4.6 x 109 y old, when should we begin to worry about the Sun running out of hydrogen for fusion?
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