This intriguing question has attracted the attention of free thinkers and scientists throughout the ages.
Plato wrote of enormous subterranean tunnels both broad and narrow that made up the earth's interior.
Dr. Edmond Halley, of comet fame, believed that all heavenly bodies were hollow and in a speech before the members of the Royal Society of London stated "Beneath the crust of the Earth, which is 500 feet thick, is a hollow void".
Then there was Leonard Euler (1707-1783), noted mathematician and one of the founders of higher mathematics. He stated that "mathematically the Earth has to be hollow". He also believed there was a center sun inside the Earth's interior, which provided daylight to a splendid subterranean civilization.
Next on the scene was Captain John Cleves Symmes, war hero of the War of 1812. Once his studies led him to believe in a Hollow Earth, he used his knowledge to convince James McBride, a Miami Ohio millionaire. Mr. McBride used his political connections to Rep. Richard M. Johnson (D) of Kentucky (later vice-president under Van Buren 1837-18411) to petition congress to finance an expedition to claim the lands inside the earth for the U.S. The petition, by a vote of 56-46 was tabled.
The Hollow Earth was next theorized by William Reed in his 1906 book "The Phantom of The Poles". Based on his studies of early Arctic explorations and scientific evidence, he states that the Earth is not solid as widely believed, but hollow with openings at both ends. In the summary of his revolutionary theory, Reed states "The Earth is hollow. The Poles, so long sought, are phantoms. There are openings at the northern and southern extremities. In the interior are vast continents, oceans, mountains and rivers. Vegetable and animal life are evident in this New World and it is probably peopled by races unknown to dwellers on the Earth's surface."
Marshall B. Gardner reached the same conclusions after 20 years of research and published his finding in "A Journey to the Earth's Interior or Have the Poles Really Been Discovered?" in 1913, revised 1920. He was unaware of Reed or his theory at the time. Mr. Gardner puts forth the argument that neither Cook nor Peary reached the True North Pole since, according to the theory, it does not exist. Mr. Gardner states "Scientific societies that considered Cook's and Peary's claims concluded that in neither case could it be said authoritatively that the explorer had reached the pole".
This controversy still exists today.
Science fiction writers have had a field day with the theory. Jules Verne's "Journey to the Center of the Earth", Edgar Rice Borrough's "Tarzan at the Earth's Core" and scores of other authors have let their talents run wild in the Inner World.
Then there are those people who claim to have visited the interior of our planet. Olaf Janson's "The Smoky God" is one such story that comes to mind. Another is "EDIDORPHA or The End Of The Earth" by John Uri Lloyd published in 1895.
Ray Palmer was one of the first researchers and reporters on the UFO scene during the 50s and 60s. In his ground breaking publications "Flying Saucers" and "Search Magazine", he speculated that, because UFOs have been seen in earth's sky throughout history , they may very well be from our earth, in fact, evidence seemed to indicate that UFOs could very well come from a subterranean world inside our earth.
Then on the cover of "Flying Saucers" magazine issue #69 - June 1970 and in issue #92 of "Search Magazine" published in July of 1970, the late Mr. Palmer published a photo that is still a controversy. Excerpts from his Editorial in the above mentioned "Flying Saucers" magazine tell it best;
"On the cover this month we reproduce the most remarkable photo ever made. It was taken by the ESSA-7 satellite on November 23, 1968 the North Pole photo lacking clouds in the polar area, therefore reveals the surface of the planet. Although, surrounding the polar area, and north of such areas as the North American continent and Greenland and the Asian continent, we can see the ice-fields 8-foot thick ice we do not see any ice fields in a large circular area directly at the geographic pole. Instead we see THE HOLE. In 1981 I came into possession of another group of NASA photos showing earth from deep in space which, not only substantiates the ESSA-7 photos, but adds weight to another feature of the hollow earth theory." http://moteprime.org/article.php?id=6
At this point any practical person will start to ask themselves, if this is all true why isn't it common and accepted knowledge. As Ray Palmer said in one of his articles
"A government that will not tell you what they know about UFOs would certainly keep the origin of them a secret".
Then there are those researchers who say some of us spend entirely too much time looking at the poles.
Certain researchers swear the earth is shaped like a giant doughnut and that holes at the poles provide an entrance into the inner lands. "Not so" shouts another group. "Entrance to the interior world can be gained only by entering a cave and discovering the subterranean tunnels".
Most of the people who claim to have visited the inner lands arrive there through old mine shafts, caves and subterranean tunnels. Others claim to have traveled through extent volcanoes. There is good solid evidence supporting all these theories. Evidence also supports the possibility of other hidden entrances to the inner realms in The Bermuda Triangle and other strange areas around the world.
One of these areas of interest in the Pacific Northwestern area of the United States. It was in this area that the name "flying saucers" was first heard.
On June 24, 1947, Kenneth Arnold, a businessman and commercial pilot from Boise, Idaho, was flying past Mount Rainier, in Mount Rainier National Park, State of Washington, when he sighted a strange formation of nine luminous saucer-shaped objects. He related this unusual experience to newsmen and news of the mysterious objects dubbed "flying saucers" was spread nationwide. UFOs are quite common in the area. In fact the thousands of miles of untrodden land, that makes up the extreme Northwestern part of America hides many unexplained mysteries.
Research/Writer Don Wilson wrote a book about a theory postulated by Soviet Scientists in the mid 1970's wherein they reckoned that our Moon was hollowed out - a spaceship in fact and it was not always there. The Soviets showed that the Moon has a very tough outer skin and all craters are very shallow regardless of the width of the meteor which struck and formed them. The only exception is this newly photographed crater at the Moon's South Pole. It is much deeper than any of the other craters. The average density of the Moon is the same as aluminum. There are all sorts of funny things which have happened on the Moon. Clouds of water vapor have been seen and measured by astronomers. All sorts of funny clouds have come out from the Moon. Many of the anomalies on the Moon have been documented by astronomers and are known as Transient Lunar Phenomena (TLPs). The seismic data is extremely impressive too because it had scientists literally falling off their chairs when the first seismic information was in. There was also an analysis done by a scientist at NASA in 1962 wherein he concluded that the Moon must be hollow.
What is interesting - and you should keep this in mind - is that if one object is hollow, then it is likely that most everything else might be too. In Astronomy, mass is dealt with on the basis of relative masses. So if the Moon is Hollow, then so could the Earth and everything else be - because gravity is based on masses - relative masses and distances. If only one object was hollow, then it would stand out like a sore thumb . . . . . But, what if they all were?
What do you think?
Whether Fact or Fiction, it's an interesting topic.
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Brooks Agnew is the leader of the 2007 North Pole Inner Earth Expedition. 100 scientists, ET experts, Exopolitics leaders, and film makers are launching what may be the greatest geological expedition in the history of the world; to see if the Earth may in fact be hollow. Hollow Earth theory has been debated for over 100 years, but this is the first civilian privately-funded expedition in history that is designed to discover the truth once and for all. Brooks Agnew is a commercial scientist, patented engineer, best-selling author, talk radio host, and Earth explorer. He hosts one of the largest web-cast radio programs in North America; X-Squared Radio. He is the managing trustee for Phoenix Science Foundation.