An underground particle detector called the Borexino detector has detected 53 antielectron neutrinos emanating from the Earth, so-called geoneutrinos. The interior of the Borexino detector. Image credit: Borexino Collaboration. Neutrinos and their antimatter counterpart, antineutrinos, are subatomic particles that interact so rarely with other matter they can pass untouched through a wall of lead stretching from the Earth to the Moon. These particles...
