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Tidal heating. You can think of this, I guess the best way to explain this is you have two bodies, two let's say planets orbiting each other or a planet orbiting a star. Even the sun, let's even look at our sun with the Earth here as we're orbiting the sun. And the Sun has got its gravitational field pulling us in, our planet as it's racing around, accelerating around the Sun in its orbit, is trying to pull away. And that produces tidal forces, pulling the Earth towards it, the Earth is pulling away, and the Earth has got this kind of belly-to-football shape to it along the equator. So tidal forces. And these tidal forces change. Those tidal forces change even in the Earth as we're going around in orbit because our orbit is elliptical. So at some point, we're closer to the Sun and other times we're further away. And so the Earth's ablateness, its flatness, changes over time. So as it's doing this, it expands and contracts, compresses and shrinks and expands again, it heats, stopping.