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The famous NASA tether incident STS-75, is said to be a video with good and genuine UFO evidence.
For non-technical and mistery-attracted people, there may be misteries. But in close inspection and understanding of some hidden little optical and technical principles, then the "space debris" explanation is the winner, and the most logical and likelihood solution, so easy that, for many is unbelievable. The UFO hypothesis is just that: a speculation, a good solution for everything that surpass immediate understanding.
There are many aspects of the NASA video, only one of these is presented here using a little easy experiment in my backyard,....the illusion of little defocused particle appearing big and behind distant strings (or objects). Take a look.