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hydrogen line
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English
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has an article on:
hydrogen line
Wikipedia
Noun
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hydrogen
line
(
plural
hydrogen lines
)
(
physics
,
astronomy
)
a
spectral line
of
atomic
hydrogen having a
wavelength
of about 21cm; used extensively in
radio astronomy
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:
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English countable nouns
English multiword terms
en:Physics
en:Astronomy
en:Hydrogen
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