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Samarium-146 is one of the main tools for establishing the evolution of the solar system over its first few hundred million years.
It is a radioactive atom that is used as a clock for dating the separation of mantles of the terrestrial planets — e.g., Earth, the moon, Mars and meteorite parent bodies — to regions with different chemical compositions, including the formation of crust from the mantle, in the early solar system. Rest of article with all images here: