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Quotation from Relativity: The Special and General Theory by Albert Einstein
“If the displacement of spectral lines towards the red by the gravitational potential does not exist, then the general theory of relativity will be untenable.”
Relativity: The Special and General Theory, Appendix III, trans. Robert W. Lawson
Einstein names an observation that would refute the general theory, while observations of the red shift were still disputed.
Citation: "If the displacement of spectral lines towards the red by the gravitational potential does not exist, then the general theory of relativity will be untenable." — Albert Einstein, Relativity: The Special and General Theory, Appendix III, trans. Robert W. Lawson. (id einstein-relativity-q6)
Portrait: Einstein 1921 by F Schmutzer - restoration, Ferdinand Schmutzer, Public domain.
