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It's accelerating towards the planet (so there's a force), but it doesn't move towards the planet.
The case is simple if it is orbiting another body but what about when it is doing it remote from any other bodies ?
I can but assume that it is radiating energy albeit at very low power as a gravity wave (gravitons ?) that leaves it at light velocity.
Can I just say that none of the above answers constitutes a serious scientific answer.
Can I just say that none of the above answers constitutes a serious scientific answer. Forget about planets, space, closed systems etc. The reason for placing the question in space away from other objects was to prevent simplistic answers around centridepal and centrifugal forces. The fact is we have a body in motion that is constantly maintaining its energy state by traveling in a circle, but needing to expend energy to maintain that state. Where is the energy going.