摘要: Within experimental error, meteorites have one age as determined by three independent radiometric methods. The most accurate method (Pb207/Pb206 gives an of 4.55 ± 0.07 × 109 yr. Using certain assumptions which are apparently justified, can define the isotopic evolution lead for any meteoritic body. It is found that earth meets requirements this definition. therefore believed same meteorites. This time since attained its present mass
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