The night sky in the World
Satellite monitoring of the artificial night sky brightness and the stellar visibility
Note that Maine represents the largest area of night sky in the eastern United States that is free of light pollution. Most rare indeed.
But NRCM cares not of destroying this night sky with the light pollution from the aircraft lights on perhaps 1,800 useless wind turbines.
Please see the reference to Maine's rare night sky made by the Maine Appalachian Club at: