Four-part BBC series in which physicist Professor Brian Cox explains the powerful forces that underpin our life on planet Earth. Cox travels around the globe and, as he visits some of the world's most spectacular sites, he uses the scientific laws of nature to explain the stunning beauty of the natural world. On his travels, he provides answers to questions including why the sky is blue, why we have seasons, why honeycombs are hexagonal and why we don't feel the Earth spinning. The episodes are: 'The Universe in a Snowflake', 'Somewhere in Spacetime', 'The Moth and the Flame' and 'The Pale Blue Dot'.