1redgiants

= __R e d G i a n t __ =



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Star is a huge, shinning ball in space that produces a What is left is a core or central region made of alphas (nuclei of Helium Atoms). Because it has run out of fuel, the star begins to cool,and contract. The outer layers of the star fall inwards under gravity, and as they fall they heat up. Meanwhile inside the shell, the core of the star shrinks and heats up enough to fuse the Heliun Nuclei together into even heavier ones. Burns up of hydron at the center, about 10billion for the sun which is 5billion year old. Collaps toward center becoming hotter than before. Increases fusion rate in shells, causing expansion.Expansion takes energy, ao surface cools and reddens. Star expands greatly and reddended luminosity increases because, even though it is collor.
 * tremendous amount of light and other from of energy.**

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** When the hydrogn in the core of an intermediate-mass star has fused into helium, the star change rapidly. ** A red giant has exhausted its core supply of hydrogen and is now fusing hydrogen to helium in a shell outside the core. The nearest red giant to the Sun is Gacrux (Gamma Crucis). Although red giants are quite common among the stars visible to the naked eye, they are actually quite rare in space. This is because they last for only a small fraction of a star's life. Prior to the 1990s, the distances to red giants (and hence their luminosities) were not well known. Thanks to the Hipparcos mission (1989-1993), the distances to many red giants have been determined to good accuracy.



=// __ Re d G i a n t S c inentific imformation __ //= = __QUICK FACTS__; = =1 . It is a huge star. = = 2.A shinning ball. = = 3.It produces a tremendos amount of light. = = 4.Lots of energy. = = 5.Largest star in the sky. = = 6.Super giant is the greatest in size. = = 7.It fits over 500 PLUTO'S = = 8.300 BILLION EARTHS = = 9.100 BILLION JUPITERS = = 10.Lose dense, hot,and luminous core surrounding. = = WEB LINKS = = 1.[] 2.Http://arxin.org/abs/0711.0248 = = 3.[] = = 4.[] = = 5.[] = = 6.[] = = 7. [|http://www.astro.uiuc.edu/~kaler/sow/staWeb links;]**Bibliographical info/Refrerences**   = = 1.(Encyclopeidia)- World book,Paul J. Green, World book,United states of america,2007 = = 2.(book)- Mr.Clements told m eto look in the //__ENCYCLOEIDIA__// = = 3.(website)- http.//arxiv.org/abs/0711.0248 = = 4.(Other)Google.com =
 * **The three main RED GIANTS are ARCTURES, ALDEBARAN, and MIRA.**
 * **Fro stars of less than four solor masses,hydrogen burn- up at the center triggers, expansion to the RED GIANT phase.**
 * **Surface of 2,500 to 3,500*c**
 * **Diameter between 10 and100 times, times that of the sun.**
 * **Although RED GIANTS are quite common among the stars visible to the naked eye, they are actually quite rare in space.**
 * **After a few billion years the center of a star runs out of protons (nuclei of hydrogen atoms)**
 * **Because it has run out of fuel, the star begins to cool, and contract.**
 * **The outer layers of the star fall inwards under gravity, and as they fall they heat up.**
 * **A shell surrounding the central core becomes hot enough to fuse protons into alphas.**
 * **So the star gains a new source of energy**

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