What We Still Don't Know - 2 of 3
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WHY ARE WE HERE?
Everything you thought you knew about the universe is wrong. Itâ€™s made of atoms, right? Wrong. Atoms only account for a measly 15% of everything that exists. The mass of the universe consists of something so mysterious and elusive that it has been dubbed â€˜dark matterâ€™.
Astronomer Sir Martin Rees Investigates
A Channel 4 (UK) Documentary