Optionally, it could ignore the earth, so that you could look around and down and see the entire celestial sphere. You could also change spectrum to see the sky in infrared or other bands. The time could also be changed, so that you could see a supernova brightening a thousand years ago, or see a rocket launch, ( probably through the earth because they're relatively low ), like the Apollo launch or even Goddard's rocket experiments. Fictional craft could be added, so you could see O'Neill colonies at L5 or the 80 million pound thrust Sea Dragon lifting off.
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