Horizon
Horizon is a documentary on BBC4. Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before. The popular program has been available since 2025. A total of 9 episodes have been broadcast, most recently in April 2026.
Last episode
Horizon
Horizon follows an international team of volcanologists in Iceland as they draw fascinating parallels between the volcanoes on Earth and those elsewhere in the solar system.
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The incredible story of how Pluto has been propelled from an unremarkable ball of ice on the edge of the solar system to a world of unimaginable complexity - where some form of alien life might exist.
Horizon explores the artificial intelligence required to replace human drivers and explores the implications of a driverless world. First broadcast in 2017.
The story of how our solar system will be transformed by the ageing sun before coming to a spectacular end in about eight billion years.
First transmitted in 1998, this is the story of four men who orbited Earth on board the ill-fated Mir space station.
Astronaut Tim Peake's video diary of the two years leading up to his arrival at the International Space Station in December 2015.
Documentary which follows the everyday people battling in the most extreme environment on earth to move Halley VI, a vital polar research station.
As more people than ever report struggling with their sleep, Michael Mosley uses the latest science to explore how this impacts our health and what can be done to improve our sleep.
Episodes 2025
Series exploring topical scientific issues. A look at the fledgling field of extraterrestrial meteorology, as technology allows astronomers to study other planets in new ways.