- Becauseoftheirheft,theclustersactlikegiantcosmiclenses,magnifying,distortingandbendinganylightthatpassesthroughthem-aneffectknownasgravitationallensing.Gravitationallensingworkslikethis:Whenalargenearbyobjectlikeagalaxyblocksadistantobject,suchasanot...
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