Series exploring topical scientific issues. To celebrate its 50th birthday, Horizon invites the public to play a role in tackling the greatest challenges facing science today. Show more

Jim Al-Khalili tackles the greatest question in science - how the universe began. By recreating key experiments Jim unravels the mystery of science's creation story. Show more

Jim Al-Khalili carries us into the future to try to discover how the universe will end - with a bang or a whimper? He reveals a universe far stranger than anyone imagined. Show more

Dr Helen Czerski peers into the heart of the storm to find out how advances in technology are giving new insight into tornadoes - the fastest winds on the planet. Show more

Dr Helen Czerski looks at the latest scientific insight into the aurora - dancing lights in the night sky that have fascinated cultures throughout our history. Show more

Two-part documentary. Chris Jackson and his fellow geologists head for the volcano Nyamulagira - one of the most active yet least explored volcanoes on the planet. Show more

A look at how the giant supercontinent Rodinia broke up 800 million years ago. Earth’s tectonic forces ripped the land apart, kicking off a series of events that sent temperatures plummeting. Show more

Veteran presenter Johnny Ball looks back over the 45 years that Horizon, and he, have been on air to find out what science has learned about how and why we grow old. Show more

The Sky at Night team look at cosmic explosions, including those of our sun and the most violent and energetic events in the universe, gamma ray bursts. Show more

Dr Helen Czerski delves into the Horizon archive to chart the transformation of a little-known theory into one of the greatest scientific undertakings in history. Show more