Why does it get dark at night? The answer comes through stories of the boundaries of the known universe, investigating our understanding of space.

This awardwinning film takes us on an epic journey to uncover the true size of the smallest particles in nature and the science of empty space, which scientists now believe is teeming with energy and exotic matter. Part science, part philosophy, and part history, this film offers a gripping and spectacular exploration of cuttingedge science with the acclaimed British TV host, Jim AlKhalili.