Gravitational lensing of the Cosmic Microwave Background (CMB) refers to the bending of CMB radiation by the gravitational fields of massive objects, such as galaxy clusters. This phenomenon alters the apparent position and brightness of the CMB, allowing astronomers to study the distribution of dark matter and understand large-scale structures in the universe. The lensing effect contributes to the anisotropies observed in the CMB, revealing important information about the early universe and cosmic evolution.
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