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http://www.youtube.com/watch?v=H8Jz6FU5D1A(3:11).

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A STAR'S LIFE CYCLE- The life of a star is explained in this video. A star begins as a large, cool mass of gas, which is forced to contract due to gravity. Temperature rises eventually lead to a process of nuclear fusion that produces a steady and vast output of energy.

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https://www.youtube.com/watch?v=_18ubTIfYbo

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https://www.youtube.com/watch?v=e-P5IFTqB98

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https://www.youtube.com/watch?v=QfNqBKAvkpw

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Star life cycle simulator
http://starinabox.lco.global/

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http://www.schoolsobservatory.org.uk/learn/astro/stars/cycle

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https://www.ck12.org/user%3Adoceo/book/Earth-Science-2.0/section/5.1/?utm_medium=email&utm_source=share-content-share-this-resource&utm_campaign=product

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(4:24).

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Neutron stars are created when a massive star runs out of fuel and collapses. As the star collapses, the density becomes so immense that protons and electrons are squeezed tightly together to form neutrons. The end result is a star only 20 km across but weighing 1 1/2 times more than our sun and made up mostly of neutrons.