Nova: Magnetic Storm (2003) Rating: Starring: Director: Category: Television, Special Interest, Television, Special Interest Studio: WGBH Boston Video Subtitles: Length: 60 mins     What Is Weakening Earth's Invisible Shield? Magnets have power to attract and repel - sometimes on a massive scale. The Earth's molten core - a violent mix of searing heat, crushing pressure, and a billion trillion tons of liquid iron - creates an invisible shield that surrounds the globe, guarding against a constant barrage of deadly radiation from space. But over the last few decades, the Earth's magnetic fieldhas weakened dramatically, intriguing scientists across the globe. The power generated 2000 miles beneath our feet protects us every day, but the loss of Earth's magnetic field is a brewing storm that affects us all. While Experts research and debate, persistent questions remain. Is a rare geomagnetic reversal the cause of earth's inner turmoil? And if the magnetic field were to vanish altogether, would Earth become as lifeless as Mars? Travel from Hawaii's molten lava flows to the mountains of Oregon and into the far reaches of outer space for a charged look at Earth's magnetic history and potentially deadly future. Nova: Mind-Altering Television Experience the drama of discovering the wonders of our world - from the miracle of life, to the top of the world and the depths of space, from the power of wild weather, to the marvels of technology, and more. See for yourself why for 30 years, Nova has been the most watched, most acclaimed science show on television.