50: The fresh fields of hydrogen
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What is the Sun? Powers of Ten™: The famous video from 1977 that explains the scale of the universe (YouTube) The Sun (Wikipedia) Formation of the Sun (Wikipedia) The Sun is about 4.6 billion years old: Facts about the Sun’s age, size & history (Space.com) How is a star born? (Scientific American) How does a star ignite? (Physics Stack Exchange) Cosmic dust (Wikipedia) All you need is cold gas: The legacy of K. E. Edgeworth (NED) Stars form out in the cold & fuel the growth of supermassive black holes (SMH) Newton's laws (Hyperphysics) Animation of Jupiter seen in the infrared (NASA/JPL Caltech) What is fusion (livescience) Nuclear fusion (Hyperphysics) Nuclear fusion in stars (Wikipedia) After 60 years, is nuclear fusion finally poised to deliver? (The Guardian) Chain reaction (Wikipedia) Diana Ross: Chain Reaction (YouTube) The Sun's structure & energy production (Wikipedia) National Ignition Facility recreates the interior of heavy stars (ars Technica) Naming conventions for our Sun or 'Sol' (Wikipedia)…