What sparks the torch of exploration? Is it the dream of distant shores, wealth, or power? Exploration is motivated by all of these factors, but often it is for the pure joy of scientific discovery. The Endless Horizon traces exploration through the ages, as humankind has ventured over land and sea in search of the unknown. Now we stand upon the shores of a vast cosmic ocean, our sailing ships are rockets and space probes gathering information, helping to give us a better understanding of our Universe. Learn of the past and present efforts of the greatest explorers the human race has known, in this program narrated by Patrick Stewart.