Dark Energy Mapped

Dark energy is a mysterious unknown entity that permeates space and accounts for 68% of the total energy in the Universe. Nevertheless, we still can’t directly detect it, so an international group of scientists are aiming to map the distribution of dark energy in the night sky. But how do you map something that you can’t see? And what is dark energy anyway?  Liam Messin spoke to project member Joe Zuntz, from the University of Edinburgh...