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jbeech- t1_ixx8j9t wrote

And I suppose landing on said planet and weighing a known 1Kg bar is out of the question, eh? I can see it now, aliens visit the Earth to purchase 1kg bars expressly for the purpose of having a quick and dirty calculation of G for any planet they visit.

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drillpress42 t1_iy0ake2 wrote

Or, we discover a 1kg bar here with an alien inscription and we then know they know Earth's mass.

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