Earth's true age was a subject of much debate among scientists in the 19th century. And rather than geologists taking the helm, it was physicists who realized that this giant ball of rock we live on must be far older than the thousands of years that had been assumed in prior centuries. Their main reasoning was heat.
Some two and a half centuries ago, the foremost experts on scientific matters knew a thing or two about heat. They knew, for instance, how heat could be transferred from one place to another. A new science was about to emerge out of this knowledge, a science called thermodynamics, which means "movements of heat" in Greek.
numbers of particles when they come together. It gives us, humans, a way to understand how particles behave when there is a lot of them without needing to refer to each one of them individually. It shows us how properties that don't exist on their own arise when many particles are together. It deals with these things we call emergent phenomena, such as heat and pressure, and which [Philip] Anderson's "More Is Different" tried to make sense of.
The scientist held fast to his belief, though, piling on layer after layer of clothing to keep himself ever warmer. Unfortunately, the bulk made it difficult to move, and he eventually missed a step on his own staircase and died from the fall.
Lord Kelvin giving a lecture at Glasgow University in 1899. (Image credit: Universal Images Group/Getty Images)
With Carnot's vision, the way hot objects cool down began to be understood, raising hopes that the resolution of one particular problem might be imminent: the determination of the Earth's age. Were we to somehow guess how hot our planet was at birth, thermodynamics could then be used to tell us how much time had gone by for it to have cooled to its present temperature. Many scientists tried it, keen to be the first one to nail the true age of our world.
Refining his calculations, he then announced that the world was 100 million years old, before settling for 40 million again.
The same Kelvin after whom the Kelvin unit of absolute temperature is named. A scientific superstar who had the power to undo, in a snap of fingers, the career of anyone who disagreed with him.
That being said, and however wrong the results, Kelvin's calculations were beautiful, giving whoever wanted to think about the problem of the age of the Earth a way forward, which is exactly what one of his former students, Northern Irishman John Perry, did. He thought that Kelvin had overlooked something. As a man of science talking to his former mentor (and job provider), Perry explained his vision to Kelvin but was ignored.
John Perry, a student of Kelvin's, who realized Earth was billions of years old — and that its mantle was a liquid, not a solid. (Image credit: Science Photo Library)It would have saved us all quite a bit of time had this not been the case, because Perry not only found a much more correct way to picture the Earth and estimate its age than Kelvin had, but he also found the source of the power that makes our planet's continents drift.
No wonder his former master didn't take him seriously. However, he pictured the mantle behaving like a liquid only when considered over long periods of time. Sandwiched between a hot core and a colder crust that very much looked like a lid, he believed the mantle had no choice but to behave just like water does in a heated pan, with the hottest parts at the bottom rising and cooling before diving back down and rising up again, in repeated loops, albeit in extremely slow motion. This type of movement is called convection, and it happens in solids, too.
Exclusive to Live Science ProIf he was right, there would be two immediate consequences. The first one was that the time it would take for our planet's surface to cool down from red hot to its current temperature could now be far longer than Kelvin had estimated. The lid and the convection patterns prevented our planet from quickly radiating away all its energy into space, so we were now inhabiting an Earth that could be as old as 2 or 3 billion years. Maybe even more. Such timescales were unheard of in the scientific community. Back then, no one knew that the universe itself was 13.8 billion years old. They knew next to nothing.
Nowadays, these broken pieces of our planet's surface have all been mapped. They are our world's plates and their movements through time are called plate tectonics. Today, most of us have heard about plate tectonics. Back then, however, no one had, and if very few people remember Perry today, it is because another scientific breakthrough made the estimation of the age of the Earth much easier and precise, showing us that our world isn't 2 or 3 billion years old, as Perry suggested, but precisely 4.567 billion, give or take a few million.
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University of Chicago Press This Is Life: How the Science of the Cosmos Explains What We AreIn this immersive and mind-expanding book, acclaimed physicist Christophe Galfard takes you on an adventure like no other to answer the fundamental question: what is life? You’ll travel back in time to witness the cataclysmic asteroid impact that doomed the dinosaurs, experience the tumultuous forces that shaped our planet, and discover how the first stirrings of life emerged from inanimate matter.
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