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All true, no doubt. Masses vary, acceleration due to gravity does not. That's why they can distinguish the two. How they discriminate a layer of water between the ice and rock, I have no idea.
'Centrifugal force' is really a change in angular momentum. I doubt that varies.
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.Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster
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.Three conspiracy theorists walk into a bar --You can't say that is a coincidence.
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