Opinion Universities in the US have long wrangled over who owns the world’s largest drum. Unsubstantiated claims to the title have included the “Purdue Big Bass Drum” and “Big Bertha”, which interestingly was named after the German World War I cannon and ended up becoming radioactive during the Manhattan Project. Unfortunately for the Americans, however, the Guinness Book of World Records says a traditional Korean “CheonGo” drum holds the true title. This is over 5.5 metres in diameter, some six metres tall and weighs over seven tonnes. But my latest scientific results, just published in Nature Communications, have blown all of the contenders away. That’s because the world’s largest drum is actually several tens of times larger than our planet—and it exists in space. You may think this is nonsense. But the magnetic field (magnetosphere) that surrounds the Earth, protecting us by diverting the solar wind around the planet, is a gigantic and complicated musical instrument. We’ve known for 50 years or so that weak magnetic types of sound waves can bounce around and resonate within this environment, forming well defined notes in exactly the same way wind and stringed instruments do. But these notes form at frequencies tens of… Read full this story
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