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Because of lack of interferance objetcs in space are very easyly tracked both radar and triangulation of their signal.
Therfore, all the major countries in the world track every space object, and they have since they first started to worry about nuclear atack from space.
I know the inredible capabilities of these systems because even working with the shitty system we have at my university we have been tracking the Japanese moon orbiter for almost six months now.
So you are saying that China, Russia, India, and France would have kept their mouths shut if the US was lying about its space achivements?