This map of the galaxy Messier 81, constructed from data taken with the Very Large Array, maps out this spiral-armed, star-forming galaxy in 21 centimeter emissions. The spin-flip transition of hydrogen, which emits light at precisely 21 centimeters in wavelength, is in many ways the most important length for radiation in the entire Universe. (Credit: NRAO/AUI/NSF)
Photons come in every wavelength you can imagine. But one particular quantum transition makes light at precisely 21 cm, and it’s magical.
In our Universe, quantum transitions are the governing rule behind every nuclear, atomic, and molecular phenomenon. Unlike the planets in our Solar System…
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