Orbit: Earth's Extraordinary Journey

Kate Humble and Dr. Helen Czerski go on a mission to chronicle the devastating effects of Earth's movements. By following its voyage around the sun for one complete orbit, 584 million miles, Humble and Czerski discover why the planet tilts and how this results in such weather events as monsoons. They also find that some of the smallest changes in Earth's movement caused ice ages and that another glacial period could happen in the future. …  MORE