A team of scientists recently announced the discovery of a mysterious empty space within the Pyramid of Khufu, or the Great Pyramid of Giza, in Egypt. This 4,500-year-old tomb is considered one of the ancient wonders of the world.
To study the inside of the pyramid, researchers used an imaging technique that detects muons. Muons are fast-moving, charged subatomic particles that are smaller than an atom. They are created when cosmic rays traveling through space strike molecules in Earth’s atmosphere.