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Once established in a stable orbit, does a satellite require ongoing energy input to keep orbiting?

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1. Once established in a stable orbit, does a satellite require ongoing energy input to keep orbiting?

Yes, it is kept in orbit by continuous remote control from a ground station

Yes, retro-rockets and solar energy keep it moving continuously

Yes, it needs continuous solar panel and solid fuel energy

No, gravity alone provides the centripetal force needed, requiring no extra energy for the orbit itself

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