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Operations done to keep a spacecraft in a particular orbit. Generally done by by thruster burns. In LEO this must be done to counteract the momentum loss to atmospheric drag. In other orbits it may be needed to maintain a planned relative position over a long period of time.
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Are there any man-made satellites at Lagrangian points?
There are 5 lagrangian points.
Are there any man-made satellites at any of those points? Is there a reason for the presence or absence of satellites at these points?