The spectrum of electromagnetic radiation has a huge range of wavelengths — and frequency and photon energy (from E = hf = hc/λ) if you choose those measures to compare instead. Wavelengths as short as 1.24 × 10–20 m were detected in 2019 in the form of very high-energy gamma rays coming from the Crab Nebula. Read about the discovery in this Physics.org news article:
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