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Such a mirror probably doesn't exist. If it did, it might be something like a large black hole in the middle of interstellar space that bends the light from earth 90 degrees to another black hole which bends it again. Voila, the light from earth going back to earth.
We couldn't go out into space and set up such a mirror, because we can't outrun light.
However, the light would end up being extremely extremely weak. So weak that it would probably be theoretically impossible to distingiush anything of any interest. A million light years is a long way to travel.
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Last edited by JHVH : 10-29-4004 BC at 09:00 PM. Reason: Time for a rest.
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