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Loading contentSearching survey images for the rare, distinctive arcs and rings of strong gravitational lensing — where a foreground mass bends the light of a background galaxy. The lenses are rare enough, and the images numerous enough, that automated finders are the only way to build large samples.
Facts on this topic will be cited from these primary and reference sources.
Mission data, planetary science, space telescopes, and public-domain imagery.
Most NASA-produced imagery is in the public domain; individual items are checked for usage terms before publication.