A.A. Penzias and R.W. Wilson were conducting radio astronomy experiments with the ultra-sensitive horn antenna at Crawford Hill, but were frustrated by a noise in its receiving system, a noise that remained constant no matter which direction they scanned. This made no sense and they suspected that it came from bird droppings on the antenna, but after a careful cleaning the noise remained. They then realized that the noise corresponded exactly with the "background radiation" posited by cosmologists who favored the Big Bang theory of creation. Penzias and Wilson had heard the Echo of Creation, and were awarded a Nobel Prize for their discovery.