The moon was created on the fourth day of the Creation Week:
And God said,Let there be lights in the firmament of the heaven to divide the day from the night; and let them be for signs, and for seasons, and for days, and years:
And let them be for lights in the firmament of the heaven to give light upon the earth:and it was so.
And God made two great lights; the greater light to rule the day, and the lesser light to rule the night: he made the stars also.
And God set them in the firmament of the heaven to give light upon the earth.
And to rule over the day and over the night, and to divide the light from the darkness: and God saw that it was good.
The core of the moon is essentially a large crystal of metallic iron. When the moon is struck by meteorites, the core will reverberate for a period of time -- depending on the strength of the impact -- much as a tuning fork does. The reason we do not hear the moon reverberating in the sky is that sound waves do not propagate through the vacuum of space between the moon and Earth.
However, in 1969, Apollo astronauts placed seismic devices on the moon's surface to measure the reverberations directly1. These devices recorded the impacts of meteorites as expected, but they also picked up a strange, persistent, low-frequency waveform. When the waveform was run through audio processing computers which sped it up and applied various filters to it, it was discovered to be an echoing voice. The voice was speaking in ancient Aramaic!
Later during 1971-1972, Apollos 14 through 17 all included in their mission objectives a project called Chapel Bell2, which, although it has been highly classified to this day by the Department of Defense, is well known to have involved the placement of more advanced seismic devices. Note the suggestive project name.
NASA has refused to release any of these recordings to the public (for the obvious reason that it contradicts their Evolutionistic position3) and the details of what the voice was actually saying have not been uncovered directly. We know it was something in Aramaic since at the time of the waveform's discovery NASA brought in linguists to try and decipher it. After a week, all the linguists returned home, with one exception: the only one who knew the ancient tongue. Regardless of the recording's precise content, it doesn't take a rocket scientist to understand what this voice truly represents; the core of the moon still reverberates with the Lord's Words from the day when He created the Heavens.
Skeptics have asked: How could the Almighty Voice of the Lord have so affected the core of the moon if sound does not transmit through a vacuum? One must remember that the moon wasn't merely affected by His voice from afar, but was created by it. It stands to reason that the intimate commingling of His Words with the moon's creation would leave some sonic trace to be discovered. Indeed, it is likely that He intended that Man's exploration of the Heavens would result in our discovery of the moon's testimony to Creation.
For more on the moon and Creation, see: Answers in Genesis: The Moon.