Submitted by LoreCriticizer t3_z53aqr in askscience
drillpress42 t1_iy0ake2 wrote
Reply to comment by jbeech- in How would one calculate the gravity of a planet? by LoreCriticizer
Or, we discover a 1kg bar here with an alien inscription and we then know they know Earth's mass.
[deleted] t1_iy0e31o wrote
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