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21 cm hydrogen line

ConceptMentioned in 1 video

A low-energy radio photon emitted by atomic hydrogen when an electron flips its spin, used to map cold gas and potentially observe the Cosmic Dark Ages.

Videos Mentioning 21 cm hydrogen line

What NEW SCIENCE Would We Discover with a Moon Telescope?

What NEW SCIENCE Would We Discover with a Moon Telescope?

PBS Space Time

A low-energy radio photon emitted by atomic hydrogen when an electron flips its spin, used to map cold gas and potentially observe the Cosmic Dark Ages.