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Researchers Yi Yang and Xiaodong Song at Peking University have presented compelling evidence suggesting that the Earth's inner core's rotation might have significantly slowed down, or even paused, around 2009-2010, and may now be rotating in the opposite direction relative to the mantle. Analyzing seismic waves from repeating earthquakes over several decades, they observed distinct changes in wave travel times, pointing to a slowdown and potential reversal. This phenomenon could subtly influence the length of our days.
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Why It’s Fascinating
The Earth's inner core, a solid ball of iron and nickel roughly the size of the Moon, is thought to spin slightly faster than the rest of the planet, driven by the geodynamo that generates our magnetic field. The idea that this super-rotation has decelerated, possibly even reversed, challenges long-held assumptions about the stable, unchanging nature of our planet's deepest interior. This shift could have subtle but significant effects on surface phenomena, including slight variations in day length and changes in the Earth's magnetic field. Scientists are now grappling with how this internal dynamism influences the planet's observable characteristics and what it means for long-term geological processes. It prompts the question: how much do the unseen movements deep within our planet truly shape our everyday experience?
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