If an observer captures an incredibly bright, wide glow across the sky with a camera, what might this artifact represent?

Answer

Camera glare or photographic artifact.

The text notes that an incredibly bright, wide glow seen across a large section of the sky in a photograph might be due to camera glare or a photographic artifact, rather than the satellites themselves seen with the unaided eye.

If an observer captures an incredibly bright, wide glow across the sky with a camera, what might this artifact represent?
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