What would an imaginary terrestrial observer see as the Sun runs out of hydrogen ? If life is confined to Earth when this happens , would life perish from heat or from cold ? Explain . As the Sun runs out of hydrogen fuel , it will start consuming helium . This leads to the sun increasing in radius , eventually turning it into a red giant . When this happens , the sun will grow so large that it can engulf the earth . Life on Earth would perish...
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