Scientists from the French Alternative Energies and Atomic Energy Commission (CEA) set up two "telescopes" that used argon gas to detect muons outside the pyramid walls, in front of the pyramid's north face and pointing in the direction of the Grand Gallery.
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Owen Jarus is a regular contributor to Live Science who writes about archaeology and humans' past. He has also written for The Independent (UK), The Canadian Press (CP) and The Associated Press (AP), among others. Owen has a bachelor of arts degree from the University of Toronto and a journalism degree from Ryerson University.