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 super-telescopes 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 striking of all, no-one really knows what they will find out there.
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Ready to Watch Horizon, Season 2011, Episode 10?