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Does the red giant phase come under The Big Bang Theory?

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The Big Bang if a different from the Red Giant Phase. The Big Bang if regarding the origin and fate of the universe, whereas, the Read Giant Phase is regarding the life of a middle sized star. There are hardly any books that conclude both the topics, but I have one, it is by Stephen Hawking, The Theory of Everything. read more

A star doesn't get cooler in the red giant phase. In fact it's core gets hotter and it's luminosity increases greatly. Only the surface temperature decreases. This is because as the star expands, the energy is spread over a much larger surface area, lowering the surface temperature. read more

Compare the illustrations below: the first shows the Sun as a red giant and compares it to the Sun at its current size (Fig. 6.2), and the second shows the measured size of Betelgeuse (Fig. 6.3). read more

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