They've been coming and going since the beginning. Far from being alone in the universe (a conceit even more feeble than the Sun rotating around the Earth) we're know in some circles as the 7-Eleven of the Milky Way.
Recent history's corporate media portrayal of the issue has been subject to a news embargo (including killing whistle blowers) because of that Eisenhower deal that I suspect people are going to be angry about when the truth emerges (which it increasingly is by the day).
