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Most of the galaxies in the Universe lie in large clusters where gavitational forces play an important role. These clusters are used to prove the Laws of General Relativity because they act as large gravitational lenses, refracting the light coming from the objects behind them. Abell 2218 is a massive gravitational lens. Image obtained using INGRID on the William Herschel Telescope. PDF version: https://www.ing.iac.es/PR/dissemination/abell2218.pdf
CREDIT
Ian Smail (University of Durham), Chris Packham (ING).
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