Forces of Nature with Brian Cox: The Pale Blue Dot

The physicist concludes his journey by examining the effects of light interacting with the Earth, travelling to Iceland to witness a moonbow - the band of colours released when moonbeams are refracted by the spray of a waterfall. He then visits the site of an enormous outpouring of lava to explain why hot things glow red, and reveals how the different colours of light energy from the sun transform the plains of the Serengeti in Tanzania and drive the migration of humpback whales to the Caribbean each year