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Unformatted text preview: sun is going to die. I thought the most interesting part was how the sun is going to die. The sun will die in approximately five billion years. As the Sun grows old, it will expand. As the core runs out of hydrogen and then helium, the core will contact and the outer layers will expand, cool, and become less bright. It will become a red giant star. The sun will then swallow Mercury, Venus, Earth, and maybe even Mars. With the sun so much bigger life may be possible on some of the moons of the gas giants. After this phase, the outer layers of the Sun will continue to expand. As this happens, the core will contract; the helium atoms in the core will fuse together, forming carbon atoms and releasing energy. The core will then be stable since the carbon atoms are not further compressible. Then the outer layers of the Sun drift off into space, forming a planetary nebula....
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- Winter '08