An electronic transition from level 
to 
in a hydrogen atom emits a photon of wavelength
where
is the Rydberg constant. At all wavelengths shorter than that corresponding to the 
to 
electronic transition of the hydrogen atom, 912Å, photons ionize hydrogen and are absorbed. Galactic space is therefore opaque at wavelengths shorter than the Lyman limit.
to in a hydrogen atom emits a photon of wavelength where
is the Rydberg constant. At all wavelengths shorter than that corresponding to the to electronic transition of the hydrogen atom, 912Å, photons ionize hydrogen and are absorbed. Galactic space is therefore opaque at wavelengths shorter than the Lyman limit.
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