Most energetic neutrino ever found on Earth detected at the bottom of the Mediterranean Sea

An artist's illustration of three neutrinos, ghostly particles which barely interact with other forms of matter.

Astronomers have detected the most powerful ghost particle ever found, and they're not sure where it came from.

The particle, which momentarily flashed across a detector inside the Cubic Kilometre Neutrino Telescope (KM3NeT) at the bottom of the Mediterranean Sea, is a neutrino with an estimated energy of 220 quadrillion electron volts — making it more than 100 times more energetic than any previously detected.