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because the moon has been studied extensively by spacecraft and has been sampled directly at a few locations |
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which have major implications for the collisional history of planetary bodies |
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whereby the various planetary and asteroidal bodies in the solar system contain a specific isotopic label |
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so that each meteorite is a small sample of a much larger parent body, probably an unidentified asteroid |
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while measurement of the oxygen isotopic composition of the Sun is the highest priority of NASA's Genesis mission |