鲍鱼tv

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)