I’m always a little amazed at how bright it is at night — not just in cities, but even out in the wilderness. Even on a moonless night, even out in the middle of nowhere, it’s not completely black.
In the darkest skies, you can probably see about 2,000 stars. They produce enough starlight for me to be able to walk around. But recently on the Washington coast there was a second source of natural light and it came from the ground.