A mind-bending, thrilling journey exploring the fragility and wonder of planet Earth, one of the most peculiar, unique places in the entire universe, brought to life by the only people…

William Shatner sits down with scientists, innovators and celebrities to discuss how the optimism of ‘Star Trek’ influenced multiple generations.

In this BBC Four 90-minute special, physics professor Jim Al-Khalili investigates the amazing science of gravity.