Nearly twenty years have passed since scientists first proposed a mysterious force, Dark Energy, pushing our universe apart.  Yet there is no direct evidence for it or any idea what it might be. Might our theories of the universe be profoundly mistaken or is an explanation of Dark Energy around the corner?

M-Theorist Michael Duff, Philosopher Massimo Pigliucci and String Theorist Erik Verlinde chase shadows in the cosmos.

From the Institute of Art and Ideas collection.