Gravitational lensing.

Gravitational lenses are one of the most fascinating phenomena in the universe, with a significant impact on the understanding of gravity and cosmic structure. In this comprehensive guide, we will explore gravitational lenses, providing a clear, accessible, and information-rich overview.

Gravitational lenses occur when a very massive object, such as a galaxy or a cluster of galaxies, distorts the space around it. This distortion causes a lensing effect, where light from distant objects is deflected and distorted. This phenomenon can be likened to how an optical lens bends visible light, but in this case, it is gravity acting as the lens.
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