It could be the ultimate archaeological discovery: a previously unknown chamber lurking beneath the stones of the Great Pyramid at Giza in Egypt. Now, a team using a cutting edge imaging technique called muography has picked up signals indicating a hidden corridor behind the famous chevron blocks on the pyramid's north face.
Muography can detect voids or empty spaces inside thick layers of earth or stone, and it is often used to plumb the depths of volcanoes. Muons are cosmic particles that hit the Earth at an average rate of 10,000 per m² per minute, though they can be absorbed or deflected by dense material. To find voids in rock, researchers set up muon-detecting plates inside a corridor in the pyramid, and they measured the amount of muons that hit over a period of 67 days. By analyzing absorption patterns in the muons that hit the plates, the researchers were able to create a 3D model showing where empty spaces might be in the structure.
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from Intriguing anomaly found inside the Great Pyramid at Giza
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