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With 2.3 Km In Length And More Than 180 Meters In Height, The Three Gorges Dam Is So Heavy That It Moved The Earth’s Axis, According To NASA
It may sound like science fiction, but it’s no exaggeration: a work made by humans managed to affect the very axis of the Earth. Literally. We are talking about the gigantic Three Gorges Hydroelectric Power Plant in China — the largest in the world, which is capable of holding such an absurd amount of water that it ended up affecting the Earth’s rotation and slightly extending the duration of days.
The confirmation came from NASA itself, which had already observed this type of phenomenon on other occasions, such as after the tsunami that devastated Southeast Asia in 2004. In that case, the displacement of large masses of water caused a slight acceleration in Earth’s rotation, shortening the days by 2.68 microseconds. Now, what we have is the reverse effect: the Chinese dam is making the days 0.06 microseconds longer.
A Dam That Weighs More Than The Whole Population Of The World
To begin to understand the scale of what is at stake, one number is worth noting: 39.3 billion cubic meters of water. This is the capacity of the Three Gorges reservoir, which extends along the Yangtze River, the longest in China. And if you are trying to imagine the weight of all this, know that it comfortably exceeds the combined weight of the entire world’s population.
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This is where the geophysical issue comes in: when such a large mass of water accumulates in a certain area — and so far from the planet’s axis of rotation — it alters the distribution of weight on Earth. The result is a slight change in the imaginary axis around which the planet rotates. In this case, the shift was about 2 centimeters, according to calculations by NASA and scientists like geophysicist Benjamin Fong Chao.
In interviews with scientific outlets, Chao explained that the farther a mass is from the axis of rotation, the greater its influence on the deceleration of Earth’s spin. It’s the same principle as a skater who spins faster when pulling in their arms and slows down when extending them.
The Power Plant That Became A Symbol Of Power — And Controversy
The construction of the Three Gorges Power Plant has never been just a matter of energy. For decades, it has been a symbol of Chinese engineering, of dominance over nature, and of geopolitical ambition. Since its announcement in the 1990s, the project has faced criticism for its environmental and social impact, including the forced displacement of more than 1.3 million people and the flooding of entire cities, archaeological sites, and areas of rich biodiversity.
Nevertheless, the Chinese government not only pushed the project forward but recently decided to triple the dam’s capacity. The decision was announced at the end of 2024 by the state agency Xinhua, transforming the structure into not only the largest hydroelectric plant in the world but also the most expensive infrastructure ever built by humanity.
But the investment has returns: the dam has the capacity to generate about 300 billion kilowatt-hours per year, helping to reduce China’s dependence on fossil fuels and solidifying itself as a key component for the growth of the country’s industry and urban areas.
Furthermore, it plays a strategic role in flood control, regulating river flow, and facilitating navigation for large vessels through previously inaccessible regions. It is no surprise that the project is seen by many as one of the greatest assets for regional economic development in the 21st century.
The Price Of Interfering With The Forces Of The Earth
Despite the energy and economic benefits, the collateral impacts of the plant continue to be a subject of heated debate. Beyond human displacement and environmental loss, a much broader — and somewhat frightening — discussion is now on the table: the fact that human structures can interfere with the planet’s own cycles.
Even though the lengthening of the days is imperceptible to us — we are talking about millionths of a second — the symbolism of what this represents is enormous. The project is a reminder that, yes, human actions are already powerful enough to alter profound planetary structures.
And the question remains: how far are we willing to go?
It is not about being alarmist. The world needs energy, water supply, and protection against natural disasters. But at the same time, constructions like the Three Gorges show that each step in that direction brings consequences that often go beyond what we can foresee — or control.
Nasa itself emphasizes that this type of alteration in the Earth’s axis is not an isolated event. With each earthquake, with each major mass displacement (such as the melting of glaciers, for example), there are changes — some minor, some major — that affect the planet’s balance. But the fact that a deliberate work, the result of human engineering, has caused a measurable impact on this axis is what really draws attention.
A Milestone Of The Human Geological Era?
For many scientists, this is yet another argument in favor of the idea that we are already living in the so-called Anthropocene — a geological era defined by the direct action of humans on the planet. And if moving the Earth’s axis with a dam is not sufficient proof of this, we may be underestimating what it really means to dominate the environment.
Ultimately, the Three Gorges Dam continues to operate at full capacity, generating energy for millions and allowing China to maintain its rapid pace of development. But with every drop of water accumulated there, the awareness grows that we are playing with mechanisms that sustain life on Earth itself.
And perhaps, as NASA has rightly warned, this is the time to think more calmly about the limits between progress and balance.
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