From the article: "The nine dimensional haystack is a model used to quantify the parameter space Earth observers must pick through to rule out the existence of

From the article: "The nine dimensional haystack is a model used to quantify the parameter space Earth observers must pick through to rule out the existence of signals originating from extraterrestrial civilizations." The image at head of page is of the well-known Wow! signal: https://en.wikipedia.org/wiki/Wow!_signal https://en.wikipedia.org/wiki/Wow!_signal