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Originally Posted by Metricyard
But where is the mass going? In the above example, you've lost 80kgs of mass. Why and where??
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80 kg is not lost: 20 "kg" of Jupiter = 100 kg of Earth. The "loss" is that they are NOT the same kilograms, but different units. Viz., each Jupiterian "kilogram", per this 5 G scenario, is worth 5 Earthian kilograms.
This is why I said "hypothetical
variable mass" in my original question, because the mass varies in a "hypo variable G" scenario. It's been my whole point all along, though it seems I had not communicated this to anybody, at least not so far... :-?
I'm now working on the other puzzle, about how much gravity would deep space need to do a "gravitational redshift" of 1 z, within the distance light travels in 1 z. Still working on it conceptually, since the SI units also need to balance. Stay tuned.