The Great Pyramid of Giza is hiding a secret chamber

The Great Pyramid of Giza is hiding a huge unexplored space - and scientists used cosmic rays to find it

• The Great Pyramid of Giza is the largest and oldest in Egypt, was built for the Pharoah Khufu around 2560 BC.
• Researchers spent two years studying the pyramid using muons - high-speed particles created after cosmic rays strike Earth's atmosphere.
• Muons can penetrate deep into rock and reveal hidden voids and chambers to special film and detectors.
• Using muons, physicists detected a void at least 100 feet long above the Grand Passageway leading to Khufu's tomb.
• No one knows what the void is, but at least one archaeologist believes it's a not a room or chamber filled with artifacts.