Definitions from Wiktionary (hydrogen line)
▸ noun: (physics, astronomy) a spectral line of atomic hydrogen having a wavelength of about 21cm; used extensively in radio astronomy
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▸ noun: (physics, astronomy) a spectral line of atomic hydrogen having a wavelength of about 21cm; used extensively in radio astronomy
Similar:
hydrogen spectrum,
hydrogen spectral series,
waterhole,
Lyman series,
absorption line,
hyperhydrogen,
helicon,
Lyman-alpha forest,
Balmer series,
Fraunhofer line,
more...
Opposite:
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▸ Rhymes of hydrogen line
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