Horizon follows the astronomers pushing the limits of science and engineering with a new generation of supertelescopes in the hunt for mysterious objects in the universe.
Around the world, a new generation of astronomers are hunting for the most mysterious objects in the universe. Young stars, black holes, even other forms of life.
They have created a dazzling new set of supertelescopes that promise to rewrite the story of the heavens.
This film follows the men and women who are pushing the limits of science and engineering in some of the most extreme environments on earth. But most strikingly of all, no-one really knows what they will find out there.
Timings (where shown) are from the start of the programme in hours and minutes