In the early 1900s, Albert Einstein developed an idea - called Relativity - that changed our understanding of reality. It explained how both space and time were flexible - and how the Universe was made of a four-dimensional fabric called space-time. This single idea gave us a new way to understand the force of gravity, explained how the stars were born and introduced us to the concept of the big bang. And, in the hands of Stephen Hawking, it allowed us to understand the most extreme monsters in the Universe - black holes. This two-part BBC documentary explores how two of the most famous scientists of the 20th Century transformed our understanding of the Universe - thus changing the world.

Two-part documentary which deals with two of the deepest questions there are - what is everything, and what is nothing? Professor Jim Al-Khalili searches for an answer to these questions as he explores the true size and shape of the universe and delves into the amazing science behind apparent nothingness.

Professor of physics Jim Al-Khalili investigates the most accurate and yet perplexing scientific theory ever - quantum physics.

Hired gun and loudmouth Mowld repeatedly drags Phungus, an anxious little alien, from his cushy life as bartender into countless outlandish adventures. Accompanied by ALIS, their hacked robot, they travel in a decrepit spaceship with an experimental Framistan Drive.