If they are in a ring, equidistant, then whatever caused their arrangement would be local and roughly the same size/shape. But if there are at varying distances

If they are in a ring, equidistant, then whatever caused their arrangement would be local and roughly the same size/shape. But if there are at varying distances, then they would be arranged into a cone, a cone pointing directly at our galaxy. That would be a much more massive structure and, frankly, rather terrifying.