So your answer, to everything that you can't answer, is; "Irrelevant"
Well done. It's quite clearly relevant to the discussion, you just don't like being wrong, so you're side-stepping the subject.
So, this hypothesis, that you don't believe in, that you have no proof, no shred of evidence for, is something you feel you should spend some time considering.
You're propping up one "hypothesis" with another "hypothesis"
Essentially, you are proposing that a mirror, of unknown origin, material and size, is being held up in the sky by an unknown force, for a seemingly irrelevant purpose. Am i correct?