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'Light we see in the Universe is only the tip of the iceberg'

What happens when 400 scientists use one of the most sensitive cameras ever built to photograph 26 million galaxies? Well, they come up with, what's been described as "the most accurate map ever produced" of the dark matter in our Universe. Professor Ofer Lahav of University College London...

(Photo: Richard Hammond at the top of a tower surrounded by dark matter Credit: BBC)

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3 minutes