>> This is what I'm interested in. Are the lights visible from this 
>> distance because they glow? Or would any old object be visible from 
>> such a distance? (Assuming it wasn't the middle of the night, obviously.)
> 
> Would you still be able to see it if you intentionally blurred your 
> vision? Sure, because the blur makes it bigger, not smaller.

And fainter.

> You can see stars that are millions (or more) light years away. That 
> doesn't mean you can tell whether it's a binary star or not.

Sure, they're quite far away (!!), but they're also rather large (!!!), 
and absurdly bright. ;-)

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