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Essay text:
"Star" Worldbook, 2002.) This Process takes about 100,000 years until it then collapse into a proto star.
Intermediate stars go through about seven phases. Phase one, T-taun phase. The T-taun phase is when a star varies in brightness. This is why a star during this phase is often called a variable star. Second phase is called the main-sequence phase. During this phase the star has begun the longest part of its life as a producer of energy form hydrogen fusion. Third phase is the Red Giant phase. During this phase the star expands and its outer layers become cooler. The star becomes redder and because the stars surface area expands this causes the star to become brighter...
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