There is evidence to indicate the Moon may be hollow. Studies of Moon rocks indicate that the Moon’s interior differs from the Earth’s mantle in ways suggesting a very small, or even nonexistent, core. As far back as 1962, NASA scientist Dr. Gordon MacDonald stated, “If the astronomical data are reduced, it is found that the data require that the interior of the Moon be less dense than the outer parts. Indeed, it would seem that the Moon is more like a hollow than a homogeneous sphere.”
Apollo 14 astronaut Dr. Edgar Mitchell, while scoffing at the possibility of a hollow moon, nevertheless admitted that since heavier materials were on the surface, it is quite possible that giant caverns exist within the Moon. MIT’s Dr. Sean C. Solomon wrote, “The Lunar Orbiter experiments vastly improved our knowledge of the Moon’s gravitational field … indicating the frightening possibility that the Moon might be hollow.”
Why frightening? The significance was stated by astronomer Carl Sagan way back in his 1966 work Intelligent Life in the Universe, “A natural satellite cannot be a hollow object.”
The most startling evidence that the Moon could be hollow came on November 20, 1969, when the Apollo 12 crew, after returning to their command ship, sent the lunar module (LM) ascent stage crashing back onto the Moon creating an artificial moonquake. The LM struck the surface about 40 miles from the Apollo 12 landing site where ultra-sensitive seismic equipment recorded something both unexpected and astounding—the Moon reverberated like a bell for more than an hour. The vibration wave took almost eight minutes to reach a peak, and then decreased in intensity. At a news conference that day, one of the co-directors of the seismic experiment, Maurice Ewing, told reporters that scientists were at a loss to explain the ringing. “As for the meaning of it, I’d rather not make an interpretation right now. But it is as though someone had struck a bell, say, in the belfry of a church a single blow and found that the reverberation from it continued for 30 minutes.”
It was later established that small vibrations had continued on the Moon for more than an hour. The phenomenon was repeated when the Apollo 13’s third stage was sent crashing onto the Moon by radio command, striking with the equivalent of 11 tons of TNT. According to NASA, this time the Moon “reacted like a gong.” Although seismic equipment was more than 108 miles from the crash site, recordings showed reverberations lasted for three hours and 20 minutes and traveled to a depth of 22 to 25 miles.
Subsequent studies of man-made crashes on the Moon yielded similar results. After one impact the Moon reverberated for four hours. This ringing coupled with the density problem on the Moon reinforces the idea of a hollow moon. Scientists hoped to record the impact of a meteor large enough to send shock waves to the Moon’s core and back and settle the issue. That opportunity came on May 13, 1972, when a large meteor stuck the Moon with the equivalent force of 200 tons of TNT. After sending shock waves deep into the interior of the Moon, scientists were baffled to find that none returned, confirming that there is something unusual about the Moon’s core, or lack thereof.
Dr. Farouk El Baz was quoted as saying, “There are many undiscovered caverns suspected to exist beneath the surface of the Moon. Several experiments have been flown to the Moon to see if there actually were such caverns.” The results of these experiments have not been made public.
It seems apparent that the Moon has a tough, hard outer shell and a light or nonexistent interior. The Moon’s shell contains dense minerals such as titanium, used on Earth in the construction of aircraft and space vehicles.
Many people still recall watching our astronauts on TV as they vainly tried to drill through the crust of a Moon maria. Their specially designed drills could only penetrate a few inches. The puzzle of the Moon’s hard surface was compounded by the discovery of what appeared to be processed metals.
Experts were surprised to find lunar rocks bearing brass, mica and amphibole in addition to the near-pure titanium. Uranium 236 and Neptunium 237 — elements not previously found in nature — were discovered in Moon rocks, according to the Argone National Laboratory. While still trying to explain the presence of these materials, scientists were further startled to learn of rust-proof iron particles in a soil sample from the Sea of Crisis. In 1976, the Associated Press reported that the Soviets had announced the discovery of iron particles that “do not rust” in samples brought back by an unmanned Moon mission in 1970. Iron that does not rust is unknown in nature and well beyond present Earth technology.
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