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A massive celestial object, such as a large galaxy or cluster of galaxies, that bends the light from objects behind it, magnifying the objects or causing multiple images of the same object[1]


  1. ^ Baumann, Mary K.; Will Hopkins, Loralee Nolletti, Michael Soluri, Steven Hawking (foreword) and Ray Villard (astronomy consultant) (2007). Cosmos: Images From Here to the Edge of the Universe. London: Duncan Baird Publishers. ISBN 1844834761 Check |isbn= value: checksum (help).  Cite uses deprecated parameter |coauthors= (help); Check date values in: |access-date= (help);
4 Milky Way (ELitU)-blank.png This article is part of Project Astronomy, a All Birds project that aims to write comprehensive articles on each term related to astronomy.

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