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The Sphinx is seen in front of the Great Pyramid on February 9, 2006 in Giza, Cairo, Egypt. (Marco Di Lauro/Getty Images)

Scientists are reporting a newly discovered "void" within the Khufu monument in Egypt by using a technique called muography. According to a Japanese study carried by the U.S. National Library of Medicine & National Institute of Health, "Muography is an emerging technique that provides information complementary to and independent from existing techniques using an elementary particle called a muon... A muon is one of the elementary particles, that can penetrate rocks thicker than 1 km [0.6 miles]." Prior to its use on the Great Pyramid, muographic technology has been used to study volcanoes.

The Great Pyramid is located at Giza on the outskirts of Cairo. It is also known as Khufu's Pyramid because it was built during the reign of Pharaoh Khufu between 2509 and 2483 BC. It is the largest pyramid in Egypt and stands at 460 feet, or 140m.

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