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Thanks to gravity, Earth’s core is 2.5 years younger than its surface

We live on one solid planet, but because of Albert Einstein’s theory of relativity, Earth’s core is actually 2-and-a-half years younger than the surface, Science News reports. In his theory, Einstein outlined how very large objects can warp time, causing it to move slower where gravitational force is stronger. Since there’s no direct way to measure time at the Earth’s core, scientists used a measure called gravitational potential—how much work it takes to move an object from one place to another—to infer the time difference between Earth’s core and its surface. Though physicist Richard Feynman once theorized that there would be just a few days difference in age between the core and the surface, scientists found that gravity has resulted in a nearly 2.5 year difference, according to a paper published in this month’s issue of the European Journal of Physics. The calculations, which are strictly theoretical, did not take into account the geological processes that formed Earth’s core and surface.

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