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When was the first gravitational map of a planet or moon made by measurements from space?

I'm guessing it was a map of Earth, since that's the closest planet to us,[citation needed] but for all I've been able to learn, we might have already mapped it sufficiently from the ground.

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It was the Earth, of course. As early as 1964, scientists realized that the non-Keplerian orbits satellites gave a picture of the Earth's interior. For example, see S. K. Runcorn, "Satellite gravity measurements and a laminar viscous flow model of the earth's mantle," Journal of Geophysical Research 69.20 (1964): 4389-4394.

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  • $\begingroup$ Did this result in actual maps of the gravitational anomalies of Earth? $\endgroup$ – Joe Jun 9 '16 at 0:52

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