Thats tiny bits of debris floating close to the camera..
As a UFO fan for the last several decades... I have yet to see any real, compelling evidence.
It's quite possible that it is. When you have no depth in a one dimensional photo, anything can be misinterpreted including photographic evidence from a crime scene or anything else.
They are not camera lens artifacts, so I think we can eliminate that at least.
But what makes it more interesting is the signal loss at the same time.