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The universe’s biggest mystery

Dark matter and dark energy dominate our universe. They’re both highly mysterious, invisible and difficult to detect. So what are they, and how do we know they even exist?

00:00 - What is the universe made of?
01:53 - What is dark matter?
05:32 - What is dark energy?
08:54 - The future of the universe

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The Economist offers authoritative insight and opinion on international news, politics, business, finance, science, technology and the connections between them.
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