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Example of gravitational lensing, two galaxies in the centre are bending light around then. So instead of seeing 6 galaxies, there's only 3 galaxies, 2 front and the 3rd spread around the centre galaxies.
(ESA/Hubble & NASA, T. Treu)
Diagram
www.sciencealert.com
(ESA/Hubble & NASA, T. Treu)
Diagram
Hubble Captures a Stunning 'Einstein Ring' Magnifying The Depths of The Universe
Gravity is the weird, mysterious glue that binds the Universe together, but that's not the limit of its charms.
www.sciencealert.com