| Large atoms such as uranium are too large to hold themselves together. They contain too many protons, which all repel each other, so the nucleus breaks apart into an alpha particle and a nucleus. This type of radioactivity keeps the Earth and other planets warm. Because the rate of decay is predictable, it also allows us to date rocks and other materials. | ||
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Physical Environment > Alpha Radioactivity
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Note: Many facts have been simplified to make them easier to understand.
Click here to read Time Crystal, history of the Universe as sci-fi fantasy romance!
