I often wondered If it where possibly to put a giant mirror facing Earth a half a light year away and look at the reflection of earth in the mirror with a telescope would you have a window in time that allows you to see year in the past?
err ... yes, you would; the bit that are facing the mirror and can be seen with the limited resolution.
Or you could put a telescope facing the earth there and send the picture back.
Or you just use the satellite data we already have.
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