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They say it's 5 billion years old. How do they know?

2006-11-14 17:29:40 · 1 answers · asked by Chase 4 in Science & Mathematics Astronomy & Space

1 answers

http://en.wikipedia.org/wiki/Nucleocosmochronology

2006-11-14 18:00:09 · answer #1 · answered by Anonymous · 1 0

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