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Sachs–Wolfe effect
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<p>The Sachs–Wolfe effect, named after <a href="/facts/Rainer_K._Sachs/wwqc0kpG">Rainer K. Sachs</a> and <a href="/facts/Arthur_M._Wolfe/AtJEND1M">Arthur M. Wolfe</a>, is a property of the <a href="/facts/Cosmic_microwave_background_radiation/ThB2HkLS">cosmic microwave background radiation</a> (CMB), in which photons from the CMB are <a href="/facts/Gravitational_redshift/cEFgB3Ns">gravitationally redshifted</a>, causing the CMB spectrum to appear uneven. This effect is the predominant source of fluctuations in the CMB for angular scales larger than about ten degrees. </p>