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What is dark energy?
Dark energy makes up 70% of our Universe. And yet, we know very little about it. What we do know is that it is a force causing our Universe to expand at an accelerating rate. Dr Renato Coasta from the University of Cape Town explains this concept to Marnie Chesterton with a balloon.
(Photo: Space, stars and nebula on a purple abstract background. Credit: Getty Images)
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