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Why 21 cm is our Universe’s “magic length”

Starts With A Bang! - MediumThursday, May 1, 2025 at 2:02:26 PM
The article explores the significance of the 21 cm wavelength in the universe, highlighting its unique origin from a specific quantum transition in hydrogen atoms. This wavelength serves as a crucial tool for astronomers to study cosmic structures and the early universe, earning its "magic" reputation.
Astronomy

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