In classical physics, a vacuum is a total void—a true manifestation of nothingness. But quantum physics says that empty space isn’t really empty. Instead, it’s buzzing with “virtual” particles blipping in and out of existence too quickly to be detected. Scientists know that these virtual particles are there because they measurably tweak the qualities of regular particles.
One key property these effervescent particles change is the miniscule magnetic field generated by a single electron, known as its magnetic moment. In theory, if scientists could account for all the types of virtual particles that exist, they could run the math and figure out exactly how skewed the electron’s magnetic moment should be from
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