the pristine natural darkness maintained within the park by the DSP agreement. See also Noctcaelador Scotobiology United States National Radio Quiet Zone References External links Izera Dark-Sky Park Poloniny Dark-Sky Park Torrance Barrens Dark-Sky Preserve. Essay by Michael Silver. Royal Astronomical Society of Canada. Veľká Fatra Dark-Sky Park North Frontenac Dark Sky Preserve Astronomy Protected areas Darkness Environmental protection 1993 introductions