> 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.)
The fact that it is dark helps a lot, obviously your eye is much more
sensitive then.
According to this page:
http://math.ucr.edu/home/baez/physics/Quantum/see_a_photon.html
A rod in your eye must receive about 5-9 photons over 100 ms to tell your
brain that something is there. That is a pretty damn small amount of light.
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