The fine structure constant at red shifts Δλλ≈0.2, corresponding to an epoch around two billion years ago, has been determined using the wavelengths of a pair of O III emission lines measured in the spectra of five radio galaxies. We find α(z=0.2)α(lab)=1.001±0.002 probable error.
No takes yet. Share an insight, caveat, or question.
Bahcall et al. (1967) studied this question.
Synapse has enriched 3 closely related papers on similar clinical questions. Consider them for comparative context: