The precision with which mirrors that big have to be built is truly hilarious. They have to account for all sorts of things, like droop-due-to-gravity, etc. It wouldn’t surprise me if they were sensitive enough that the bloody coriolis effect kicked in
No problem. Just put it at the South Pole. Air’s thinner there anyway.
Yeah, but how big of an ant could you fry with it?
I recently heard about a plan by SETI to use old-style TV satellite dishes (the big ones they used to have) to make a large radio telescope array. IIRC it is going to be either a mile square or a km square.