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originally posted by: GArnold
a reply to: Vasa Croe
Sure..
Here is one I found quickly
"
4. The Puzzle of Why the Moon "Rings" like a Hollow Sphere When a Large Object Hits It: During the Apollo Moon missions, ascent stages of lunar modules as well as the spent third stages of rockets crashed on the hard surface of the moon. Each time, these caused the moon, according to NASA, to "ring like a gong or a bell." On one of the Apollo 12 flights, reverberations lasted from nearly an hour to as much as four hours. NASA is reluctant to suggest that the moon may actually be hollow, but can otherwise not explain this strange facts."
home1.gte.net...
""""For more than half a century, the moon had been mocking the best minds in science, and for Erik Asphaug enough was enough.
The taunting began three years before Asphaug was born. On Oct. 7, 1959, the Soviet Luna 3 spacecraft looped behind the moon, snapping off a series of grainy but distinct photos and then radioing them home. Because the moon’s rotation is perfectly synchronized with its revolution, one hemisphere always points toward Earth while the other always points away, unseen. Luna 3’s first-ever images of the lunar far side revealed an expanse of rugged, blandly gray highlands—a vista utterly unlike the near side’s charismatic, Man-in-the-Moon markings. It didn’t take a planetary scientist to recognize the weirdness of that split personality. “I remember as a boy seeing one of the news programs showing the far side of the moon, and thinking it was incredible that a planet could be so different on each side,” Asphaug says.
Now it was 2010 and here Asphaug was, a professor of earth and planetary sciences at the University of California, Santa Cruz, attending a colloquium, still waiting for an explanation for the moon’s aggressive asymmetry. He listened, increasingly antsy, as his colleague Ian Garrick-Bethell sketched out his proposed answer. In this latest theory, Earth’s gravity raised powerful tides on the moon billions of years ago, while it was young and molten. The bulges then froze in place, giving rise to the thicker crust and distinctive geology of the far side. The concept made no sense to Asphaug. “You’d get a bulge on both the far side and the near side, just like when you have high tide on Earth,” he says. But the whole point of the theory was to put a bulge on the far side only. “So the answer has to be that some miracle happens to erase the other half. It makes the problem even worse than before.”
Asphaug was not only annoyed; he was inspired. For years he had been working to develop models of low-velocity impacts in the early solar system. “People have been biased, looking at impacts and thinking only about hypervelocity events,” he says. “People forgot that things can hit at lower velocities.” These kinds of events are constructive rather than destructive: If two objects collide slowly enough they bump and stick together, “like throwing mud at the wall of a house or throwing snowballs at each other.” Asphaug had been thinking that low-velocity impacts, what he liked to call “splats,” could explain how comets formed. Suddenly he realized he might have the solution to the moon problem sitting right in front of him. He grabbed one of his post-docs, Martin Jutzi (now at the University of Bern), and spelled out his idea. What if Earth originally had two moons, which only later merged into the one we know?
“We went to the lab right after that seminar and we coded up the moon being hit by a companion moon,” Asphaug says. The result of those computations was a novel interpretation of lunar asymmetry. In Asphaug’s view, the jumbled lunar highlands are the wreckage of a second moon that once orbited the Earth, pasted onto the surface of the moon. Small wonder that the far side looks like a different world; it is a different world. The new model provides an integrated description of the moon’s ancient origin and its modern appearance, but to Asphaug the concept goes deeper than that. It showcases a broader, and largely overlooked, process in planetary formation: the gentle collision, in which two bodies come together in a kiss."""
The team confirmed the standing theory that the concentrations of mass were caused by massive asteroid impacts billions of years ago and determined how these impacts changed the density of material on the moon's surface and, in turn, its gravity field. A paper detailing the results will be published online by the journal Science on May 30.
originally posted by: ScientiaFortisDefendit
I'm still trying to figure out what is meant by "ringing", since there is no atmosphere on the moon or in space through which sound waves need to travel. Is that an analogy for something else?
originally posted by: ScientiaFortisDefendit
I'm still trying to figure out what is meant by "ringing", since there is no atmosphere on the moon or in space through which sound waves need to travel. Is that an analogy for something else?
originally posted by: GArnold
a reply to: Mapkar
I would agree with you... Except much of what we thought we know about the moon is wrong. Ancient cultures never mentioned a moon as having existed. The origins of the moon are in fact in total dispute. No one actually knows how it formed or when. That site I linked to has some incredible facts about the moon that defy any explanation so far.
The moon has always played an important role in Egyptian religion, even through modern times, with it's symbolisms related to the Islamic faith. During ancient times, it was never as important to the Egyptians as the sun, though the moon was considered by them to be the nightly replacement of the sun. Within all of the known creation accounts, the Sun is always paramount. However, in the relationship between the Moon and the stars, the lunar god can be designated as "ruler of the stars".
originally posted by: GArnold
I am not gonna argue if we did we land on the moon or not.. It has been reported many places the moon rang like a bell for hours after any aircraft landed on it. NASA reported it rang for 4-6 hours. My other questions are... How are the rocks from the moon billions of years older than any found on Earth.? Why has iron brought back from the moon never oxidized? How is the moon the exactly right distance from the Earth and Sun to create a perfect solar eclipse.? If it was one mile closer to Earth or to the Sun that would not happen. Just weird moon facts that so far have no answer.
Furthermore, shallow moonquakes lasted a remarkably long time. Once they got going, all continued more than 10 minutes. "The moon was ringing like a bell," Neal says.
On Earth, vibrations from quakes usually die away in only half a minute. The reason has to do with chemical weathering, Neal explains: "Water weakens stone, expanding the structure of different minerals. When energy propagates across such a compressible structure, it acts like a foam sponge--it deadens the vibrations." Even the biggest earthquakes stop shaking in less than 2 minutes.
lunar seismograms (graph)
The moon, however, is dry, cool and mostly rigid, like a chunk of stone or iron. So moonquakes set it vibrating like a tuning fork. Even if a moonquake isn't intense, "it just keeps going and going," Neal says. And for a lunar habitat, that persistence could be more significant than a moonquake's magnitude.