Fig. 1.
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Hubble image (https://esahubble.org/images/potw1403a/) of the gravitationally lensed quasar Q 0957+561 in the constellation Ursa Major. The two components are separated by ∼6″, with image B being located close (∼1″) to the lensing galaxy G1, which is a giant elliptical lying within a cluster of galaxies that also contributes to the lensing. The field of view (FoV) is ∼1 square arcmin.
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