Moon mysteries that scientists baffle

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Even though the scientists are investigating stars that thousands of light-years from the Earth, they can't answer these simple questions about the moon. 

The Moon is less in density when comparing with the earth. This means the inside part of the moon is less in density than the outside. Therefore, anyone can suspect that the moon is hollow. In 1969, NASA had a seismic wave experiment on the moon. They noticed that the vibration lasted than five hours like a ringing bell. After this experiment, even the most popular scientists around the world believed the moon is empty. 

Jupiter has a powerful gravitational field which is enough to hold many moons. Those moons are 180 times smaller than Jupiter. Think well, our moon is 1/4 size of the earth. Venus and Mercury have a same gravitational field like the Earth, but they have no moons. Practically, Earth has not an enough power to hold the moon. How does the Earth hold the moon? It is still a mystery.

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