Discovery of a big void in Khufu’s Pyramid by observation of cosmic-ray muons

@article{Morishima2017DiscoveryOA,
  title={Discovery of a big void in Khufu’s Pyramid by observation of cosmic-ray muons},
  author={Kunihiro Morishima and Mitsuaki Kuno and Akira Nishio and Nobuko Kitagawa and Yuta Manabe and Masaki Moto and Fumihiko Takasaki and Hirofumi Fujii and Kotaro Satoh and Hideyo Kodama and Kohei Hayashi and Shigeru Odaka and S{\'e}bastien Procureur and David Atti{\'e} and Simon Bouteille and D. Calvet and Christopher Filosa and Patrick Magnier and Irakli Mandjavidze and Marc Riallot and Benoit Marini and Pierre Gable and Yoshikatsu Date and Makiko Sugiura and Y. Elshayeb and Tamer Elnady and Mustapha Ezzy and Emmanuel Guerriero and Vincent Steiger and Nicolas Serikoff and Jean-Baptiste Mouret and Bernard Charl{\`e}s and Hany Helal and Mehdi Tayoubi},
  journal={Nature},
  year={2017},
  volume={552},
  pages={386-390}
}
The Great Pyramid, or Khufu’s Pyramid, was built on the Giza plateau in Egypt during the fourth dynasty by the pharaoh Khufu (Cheops), who reigned from 2509 bc to 2483 bc. Despite being one of the oldest and largest monuments on Earth, there is no consensus about how it was built. To understand its internal structure better, we imaged the pyramid using muons, which are by-products of cosmic rays that are only partially absorbed by stone. The resulting cosmic-ray muon radiography allows us to… 
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