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Over most of the measurable range it is dominated by nonlinear gravitational clustering!Gravitational lensing has also allowed Hubble to look deeper into the early days of the universe It occurs when clusters of galaxies create a distorting gravitational field that acts as a natural, giant magnifying glass for the distant galaxies beyond Hubble's viewing capabilityGravitational Lensing was discovered using the Kitt Peak National Observatory 21 meter telescope gravitational lensing the distortion of the appearance of an object by a source of gravity between it and the observer Gravitational lensing occurs when A Guide To Gravitational Lensing c Sky At Night Magazine Gravitational lensing