The Hunt For Planet B

Takes us inside the dark and mysterious world of spies, special forces and political insiders as they race to find Colonel Muammar Gaddafi's billions in a dangerous treasure hunt. In life, the Libyan leader ruled with an iron fist for 42 years and treated Libya's wealth as his own. He died the richest man on the planet with a fortune of $150 billion. A dictatorial leader in life, the spell of Gaddafi's money remained in place after his death, triggering a ruthless race to find his missing billions.

Has there ever been life on Mars? To answer that question, in 2016 Europe launched a mission that not only unleashed new technology but which started a global battle to conquer the Red Planet. With unprecedented access to the European Space Agency and France’s space agency, go from the rover design process through to the launch of Europe’s very first module, the ExoMars Trace Gas Orbiter.

NASA's brand-new Mars rover is on the hunt for alien life, and with the help of cutting-edge engineering, scientists embark on a search for fossilized remains, which might prove the Red Planet was once home to a vast ocean and extraterrestrial life.

The latest discoveries suggest that we might be on the verge of discovering life beyond our planet, and scientists are investigating if earth's life began elsewhere in the universe, and whether we need to evolve to know for sure.

New discoveries might finally reveal how supermassive black holes are made, and using the latest technology, experts are on the verge of understanding how these monsters grow and how they affect life on our planet.

In a month when the tally of confirmed exoplanets passed 5,000, it's astonishing to remember that just 30 years ago, the notion of planets outside our own solar system was, well – just a notion. Since the first extrasolar planet was discovered in 1992, a staggering array of other worlds have been identified, including many in solar systems quite unlike our own.

The oceans define the earth. They are crucial to life and we used to think that they were unique to our blue planet. But we were wrong. It has recently been discovered that there are oceans all over our solar system, and they are very similar to our own. And now scientists are going on an epic journey in search of new life in places that never seemed possible. Nasa is even planning to dive to the depths of a strange, distant ocean in a remarkable submarine. Horizon discovers that the hunt for oceans in space is marking the dawn of a new era in the search for alien life.

It follows life in the entire frozen quarter of the planet, including polar bears, Siberian tigers, snow monkeys, and penguins.

David Attenborough returns in this breathtaking documentary showcasing life on Planet Earth.