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NASA finds India's missing lunar orbiter with Earth-bound radar


So the spacecraft passes through the beam. I'm not sure how well focussed NASA can keep the beam after travelling 385,000 km. 160km probably means they can just miss the Moon and consequently remove any backscatter from the surface. They should still spot anything orbitting at 200km above the poles, especially when the craft's orbit is end on to the Earth so it will rise and fall through the aim point of the beam.

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