In June 2000, astronomers made an extraordinary discovery. One that promises to solve one of the biggest problems in cosmology - how and why galaxies are created. Incredibly, the answer involves the most weird, destructive and terrifying objects in the Universe - supermassive black holes. Scientists are beginning to believe that these forces of pure destruction actually help trigger the birth of galaxies and therefore are at the heart of the creation of stars, planets and all life. Supermassive black holes are so extraordinary that until recently, many people doubted that they existed at all. The idea of giant black holes the size of the Solar System seemed more like science fiction that reality - such monsters would be so powerful that they could destroy the very fabric of the Universe. But in the last five years a series of discoveries has changed our understanding of supermassive black holes and galaxies forever.

Episode Viewers and Ratings

Season 36 Episode 21 of Horizon resulted in a 0.00 rating in the 18-49 demographic.

Horizon Season 36 Episodes...

• s36e01 - Season 36, Episode 01
• s36e02 - Season 36, Episode 02
• s36e03 - Season 36, Episode 03
• s36e04 - Breath of Life
• s36e05 - The Lost City of Nasca
• s36e06 - The Diamond Makers
• s36e07 - Supervolcanoes
• s36e08 - Miracle in Orbit
• s36e09 - Complete Obsession
• s36e11 - Is GM Safe?
• s36e12 - Planet Hunters Part I
• s36e13 - Planet Hunters
• s36e14 - Moon Children
• s36e15 - Conjoined Twins
• s36e16 - The Lost World of Lake Vostok
• s36e17 - Vanished: The Plane That Disappeared
• s36e18 - Secret Treasures of Zeugma
• s36e19 - The Valley of Life or Death
• s36e20 - Extreme Dinosaurs
• s36e21 - Supermassive Black Holes
• s36e22 - Boy Who Was Turned Into a Girl

Horizon Show Summary

Horizon is BBC Two's flagship 50-minute science documentary series.

Recognised as the world leader in its field, it regularly wins a sweep of international science, medical and environmental film accolades, and has recently won the Royal Television Society Award and the Prix Italia.

In 2002, the British Academy of Film & Television Arts presented Horizon with the BAFTA Television Award for Best Factual Series or Strand.

In 2003 it won the prestigious Images et Science award for best medical documentary and the Carl von Linne Award at the Living Europe film festival in Sweden. That year, a Horizon co-production with WGBH Boston won the Emmy for best documentary.

In September 2014 it celebrated its 50th anniversary and it continues to enjoy outstanding critical acclaim.