We trace the Zeeman effect from Peter Zeeman’s 1896 breakthrough to today’s NASA-era applications. Learn how a magnetic field splits atomic light via electron magnetism, the difference between normal and anomalous Zeeman effects (and the Paschen–Back regime), and why this effect is a cornerstone of astrophysics, spectroscopy, and quantum optics — from solar magnetograms and space weather to laser cooling and magneto‑optical traps.

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