21 cm hydrogen line

Concept

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.

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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.