Geophysics: Terrestrial Tail

As it whirled in orbit around the moon, the instrument-crammed Soviet spaceship Luna 10 was busily recording and reporting man's first continuous supply of data about the lunar environment. Though the Russians did not tell all they learned, the information they did release confirmed that their distant capsule was carrying out its fact-finding mission with singular success.

Luna's gamma-ray measurements indicated that the moon has a crust some what similar to the earth's. The satellite also established for the first time that both the number of meteorite particles and the strength of the...

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