Most planetary scientists expected that lunar samples brought to Earth at the end of each of the six Apollo missions would confirm one of three leading hypotheses of the Moon's origin. Instead, samples left all three explanations unconfirmed, requiring the development of a new hypothesis for how the Moon formed. This video segment adapted from NOVA shows Apollo 15 astronauts collecting a type of rock that would help change our understanding of the Moon's — and Earth's — earliest history. This video is available in both English and Spanish audio, along with corresponding closed captions.
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