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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. This is a three colour image based on a 2.5 hour H band exposure obtained with CIRSI camera combined with B and I band optical CCD images, taken on the William Herschel Telescope.
CREDIT
Richard McMahon (IoA) and Konrad Kuijken (Kapteyn Institute).
For publication or display (electronic or otherwise), all photos, images or videos must be credited: "Photo/image/video courtesy of the Isaac Newton Group of Telescopes, La Palma" unless otherwise noted in the provided credit line. Please contact ING's Public Relations Officer (outreaching.iac.es) with all the details of the use.
ing.iac.es) with all the details of the use.