One of the strangest of all lunar enigmas is that when the lunar module ascent stages crashed onto the surface of the moon, the moon rang like a hollow sphere, vibrations lasting for up to four hours! While NASA officials are reluctant to postulate that the moon may be hollow, they cannot otherwise explain it.
After some difficulty, astronauts were able to drill into the extremely hard surface of the lunar maria to recover samples of rare minerals such as beryllium, zirconium, titanium and yttrium which were fused with surrounding rock at temperatures of about 4500§.
In addition to these rare minerals, American and Soviet probes recovered pure iron samples. These iron particles have not oxidized, even after two decades of exposure to Earth’s atmosphere. Although there is an iron pillar of unknown origin and age in New Delhi, India that has also never rusted, scientists are unable to explain it.
Uranium, thorium and potassium samples were found to be unusually radioactive. Using thermal equipment, astronauts discovered that heat flow near the Apennine Range was so great that scientists on Earth were convinced the area was ready to melt and that the moon’s core must be very hot. The core is not hot, however, and, indeed, if it has a core at all, it is quite cold. In addition to being extremely radioactive, the amount of material discovered is quite great, leaving scientists to wonder about its origin. If it came from the interior of the moon, how did it get to the surface?
Since some scientists agree it could not have come from the interior (since the moon appears to be a hollow sphere), how did all this radioactive material find its way to the surface of the moon and when did it happen?
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