Chasing tornadoes in Oklahoma, Brian explains how the same physics that creates these spinning storms shaped the young Solar System. And out of this celestial maelstrom emerged the jewel in the crown, Brian's second Wonder - the magnificent rings of Saturn.
Professor Brian Cox explores how the search for aliens in the solar system has followed the search for water. He looks at Jupiter's moon Europa - a dazzling ball of ice.
Brian looks at the power of the Sun, seeing a total solar eclipse in India and the Northern Lights in Norway as well as making contact with the probe, Voyager.
Professor Brian Cox witnesses a total solar eclipse in India.