Io is the closest of Jupiter’s larger moons and the most volcanic world in our solar system, with over 300 active volcanoes, thanks to its proximity to the huge gravitational pull of Jupiter. Subscribe: bit.ly/BBCEarthSub Watch more: Planet Earth bit.ly/PlanetEarthPlaylist Blue Planet bit.ly/BluePlanetPlaylist Planet Earth II bit.ly/PlanetEarthIIPlaylist Planet Dinosaur bit.ly/PlanetDinoPlaylist The Planets Professor Brian Cox tells the dramatic stories of the eight majestic planets of our solar system. The latest science allows us to piece together clues of magnificent lost waterfalls on Mars, the mass planetary migrations as they jostled for position early in their history, and even the distant fate of Saturn as one of its moons awakens to form a beautiful water world. Welcome to BBC EARTH! Want to share your views with the team? Join our fan panel: tinyurl.com/YouTube-BBCEarth-FanPanel This is a page from BBC Studios who help fund new BBC programmes. Service information and feedback: bbcworldwide.com/vod-feedback--contact-details.aspx