Very interesting if you tell me what the percentage is of Rubidium in typical lunar rock.  Thanks and Best Regards Phillip Knox Melbourne Australia

According to Hurley and Pinson (1970) from the Proceedings of the Apollo 11 Lunar Science Conference V.2 pp 1311-1315, Rb was found within Apollo 11 rock samples in the range of 1 ppm to 6 ppm.

Brad Bailey

NLSI Staff Scientist

April 16, 2009

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The moon is not round, but slightly egg shaped with the large end pointed towards earth.

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