Episode number three of the Human Universe presented by Brian Cox which explores a fundamental question that all humans have. In this documentary we debate whether we are alone in the universe or not, the answer to which no matter what it is, is a pretty frightening prospect.
Often we have to look into history to see into the future. The island of Rapa Nui was at one time in history home to Earth's most isolated civilization which did not encounter anyone from the outside world for more than 1000 years. This was mostly due to them being in the middle of the Pacific Ocean, on a tiny island thousands of miles from any other land. The arrival of a Dutch trading fleet in 1772 was the first time they came face to face with aliens. This was a pure chance across a vast ocean which in a way could be compared to aliens encountering us across the vast cosmic ocean within which we are just a pin prick.