If it has been there for 2 million years, then sure, you’d be able to see light from the point it was installed and reflecting. Are you asking what you’d be able to see? See my last reply…
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What I’m actually anticipating in 2013 is the launch of the new JWST telescope. It’ll make the mirror on hubble look like a joke. Hubble has an 7.8 ft. diameter mirror, whereas the new mirror is 21.65 wide!
If we had 1,000 more years to get more and more large mirrors in space, maybe we can see faint planets reflecting the light of their sun. from 7.8 ft. diameters, to 21.65 ft… maybe someday there will be a mammoth 5,280 ft. diameter mirror up there to see everything…
Right now, though, pointing Hubble at the mirror a million light years away would be pointless. You wouldn’t see much, and probably wouldn’t even find the mirror.
My main point of this was to get people to think, I know its not perfect but theoretically it could work and you could be looking back in time. Just think how fucking crazy it would be to look through a telescope eyepiece or even a monitor and see the past. I know there is a shit load of variables that would need to be worked out and Im not even saying its possible, im just saying it would be awesome if it were.