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Get your SPECIAL OFFER for MagellanTV here: - It's an exclusive offer for our viewers! Start your free trial today. MagellanTV is a new kind of streaming service run by filmmakers with 3,000 documentaries! Check out our personal recommendation and MagellanTV’s exclusive playlists: Why does the sun shine? Why doesn't it burn out? How long will its fuel last? To a scientist living in the 18th century, he might have compared it to a log in a fireplace. When wood burns it releases about 1 ten-millionth of a trillionth of a watt per atom. 0:00 Sun's energy 5:00 How fusion happens 7:19 Quantum tunneling 8:25 Fusion chart 9:51 Where energy comes from 12:39 Why Helium is more stable 15:14 Future of sun The mass of the sun was well understood, and translates to about 10^57 atoms. This leads to a lifetime of the sun of about 20,000 years. But we know the sun is at least 4.5 billion
