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The one constant in the Universe: StarDate magazine
Helix Nebula 
Helix Nebula 
The Helix Nebula is a wreath placed by nature around a dying star. Nearing the end of its life and running out of nuclear fuel, the star in the center of the nebula has blown off its outer atmosphere. The blue-green interior color of the nebula is caused by oxygen emission; farther out the red color is caused by hydrogen emission. Our Sun will likely meet the same fate in about five billion years. (Tom Montemayor)

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