You need energy to produce a force that compensates gravity. So if you apply that force for a huge amount of time, will gravity ever be depleted?
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No. The laws of thermodynamics ensure that you can never come out ahead in *any* energy transfer. Gravity can only move a body from a higher potential energy state to a lower one. If that were not the case then you could theoretically throw a ball and have it go higher with each successive bounce.
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