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What is the final stage of our Sun?

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The Sun, like most stars in the Universe, is on the main sequence stage of its life, during which nuclear fusion reactions in its core fuse hydrogen into helium. Every second, 600 million tons of matter are converted into neutrinos, solar radiation, and roughly 4 x 10 27 Watts of energy. read more

For example, the star Antares is an M type supergiant. It has a luminosity 13,000 times that of the Sun. For low mass stars, this is the final stage of their lifetime in which they generate energy via fusion. Once the helium and hydrogen shell fusion uses up all of the available fuel, the star's life is effectively over. read more

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The metamorphosis of our Sun from a main sequence star to ...
Source: pinterest.com