Even with all of the advancements in modern technology, we still haven’t made contact with intelligent life on other planets. But what if our attempts to communicate have been ignored?

In 1973, a radio astronomer named John Ball came up with a possible theory as to why aliens – if they do exist – haven’t gotten back to us. Ball’s “Zoo Hypothesis” as it came to be known, posits that alien civilizations exist, and the most highly developed of them have been communicating. This elite alien “club” has come upon a mutual agreement to leave those deemed primitive or “lesser” life forms alone, only to be watched from a distance. Earthlings, therefore, did not make the cut with the galactic cool kids.

So assuming these aliens exist, under what circumstances could they all agree to keep us in the dark? A Scottish astronomer named Duncan Forgan has the answer.

Not "the" answer, but one answer. To read more, click here.