NASA Confirms China's Megastructure Has a Hidden Power That Could Slow Earth's Spin with a Single Move

Key Points:

• The Three Gorges Dam in central China, completed in 2012, holds back 40 cubic kilometers of water at an elevation of 175 meters, causing a measurable but extremely small change in Earth's rotation by redistributing mass farther from the planet's axis.
• NASA scientists Dr. Benjamin Fong Chao and Dr. Richard Gross calculated that the dam lengthens the day by about 0.06 microseconds and shifts Earth's rotational pole by approximately 2 centimeters, effects far smaller than those caused by natural events like the 2004 Indian Ocean earthquake.
• The dam's impact on Earth's rotation is real but negligible compared to larger forces such as the moon's gravitational pull, which slows Earth's rotation by about 1.7 milliseconds per century, roughly 17,000 times the dam's annual effect.
• Human activities, including groundwater extraction and climate-induced ice melt, also contribute to slight but measurable changes in Earth's rotation and polar motion, highlighting the growing intersection between human actions and planetary-scale physics.
• Despite these scientific findings, the primary importance of the Three Gorges Dam remains its role in energy generation, flood control, and regional environmental changes, with its effect on Earth's rotation considered a minor scientific curiosity.