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The age of the Moon, as determined by radioactive measurements of rocks brought back by astronauts, ...

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The age of the Moon, as determined by radioactive measurements of rocks brought back by astronauts, ...

The age of the Moon, as determined by radioactive measurements of rocks brought back by astronauts, appears to be

(a)   similar to that of Earth, about 4.6 billion years.
(b)   very much younger than Earth, indicating that it was probably broken from the Earth by a collision about 1 billion years ago.
(c)   very much older than Earth, suggesting that it formed elsewhere in the Universe and was subsequently captured by the gravitational field of Earth.

Textbook

Discovering the Universe

Edition: 7^th

Authors: Kaufmann, Comins

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