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Unformatted text preview: Lee Hoeppner April 26, 2010 Astronomy 100 Unit 64 RQ-1. The Sun will spend approximately 10 billion years in its main-sequence phase, consuming the hydrogen in its core. It will then spend about one-tenth as long, about a billion years, as a red giant. It will spend most of this red giant phase just fusing hydrogen into helium in a shell surrounding the core. After this event, the Suns structure will rapidly change from that of a red giant to that of a smaller yellow giant. When the helium in the Suns core is consumed, the core will again be unsupported, as it was at the end of the main sequence. The Suns atmosphere will re-expand to an even greater diameter than it had when it first entered the red giant stage. The Sun will expand so much by the end of this phase that it will be classified as a bright giant with a luminosity about 200 times greater than it has now. By the end of this phase, electron degeneracy pressure will hault the compression, and the Suns core will begin to...
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- Spring '10