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ecksor
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- 0
i am wondering if we know decays like Samarium-neodymium and Rubidium-strontium with half-lives of 106 and 49 billion years, why scientists consider the age of Earth based on Uranium-lead dating with half-life of 4.47 billion years? i mean if there wasn't Earth 100 billion years ago, where these Samarium comes from?