Have you ever wondered how old Earth is? We’ll, if you’re not religious, science shows that the earth is approximately 4.5 billion years old. Now have you thought about how old the center of our Earth is? Common sense would lead you to believe it’s the same age, but new calculations show that the center of earth is younger than the surface.
The reason for this shift in time is gravity. Massive objects like our planet create a large gravitational pull. This pull slows time down, and is stronger at the center of the object. These shifts are determined by ‘gravitational potential’, a measurement of the amount of work required to move an object from one place to another.
Earth’s center would have much stronger gravity than the surface, requiring more energy to move towards the surface. This means that time at the center would run, gradually getting faster as you got closer to the surface.
So just how much younger is the center of the earth? Well, the new calculations show that over the 4.5 billion years of existence, the gradual shaving of time makes the center of Earth about 2.5 years younger.
Previously thought to be younger by Theoretical physicist Richard Feynman in the 1960s, it turns out he was just a bit off in thinking that it was only a few days older.
While the new calculations are accurate based on the pull of gravity warping time, they do not factor in the actualy geological creation of the different layers of our planet. We aren’t sure how long it took to completely form in size, and the core would be on of the first things to form. So the center may in fact be older if the forming of the crust took longer than two years.