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How is it possible that the moon always faces the Earth?Report an ErrorThe Earth's gravity holds it steadyIt has a synchronous orbitThe moon does not revolveThe moon never rotates

Question

How is it possible that the moon always faces the Earth?Report an ErrorThe Earth's gravity holds it steadyIt has a synchronous orbitThe moon does not revolveThe moon never rotates

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Solution

The moon always faces the Earth due to a phenomenon called tidal locking, or synchronous rotation. Here's a step-by-step explanation:

  1. The moon does rotate on its axis and it also revolves around the Earth. However, it takes the same amount of time to do both - about 27.3 days. This is known as synchronous rotation.

  2. The gravitational interaction between the Earth and the moon causes the moon to bulge slightly along the line connecting the two bodies. This bulge acts like a 'handle' that Earth's gravity can 'grab onto'.

  3. Over time, Earth's gravitational pull slowed down the rotation of the moon to match the time it takes to orbit the Earth. This is why we always see the same face of the moon.

  4. The moon is not perfectly spherical, but slightly elongated. The Earth's gravity pulls on the closest part of the moon more strongly than the far side, creating a tidal bulge. This bulge aligns with the Earth, keeping the same face of the moon always towards the Earth.

  5. This process is not unique to the Earth and the moon. Many other moons in our solar system are tidally locked with their planets.

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