Okay like, if there was a giant mirror 1 light away facing earth, and we had like a perfect telescope pointed to it, and looked in it, would we be seeing earth, 1 year ago, because of the time it takes for light to go from earth to the mirror? If that's the case, in the far future when we get light speed traveling, we could place mirrors thousands of light years away and see what happened thousands of years ago! That's loving awesome.
Idk man I think of weird stuff sometimes.