The mutual gravity during the merger is warping the galaxies' shapes to form a ring.
To capture the image of Arp-Madore 417-391, Hubble relied on its Advanced Camera for Surveys, which is specifically tailored to hunt for ancient galaxies and galaxy clusters that formed in the early days of the universe. Theis much better suited for this kind of deep-space observation, however, thanks to its sensors that can see much further into the infrared spectrum and, therefore, reveal finer details of galaxies that are even older than Arp-Madore 417-391.
It's too soon to say whether Webb will make a return to Arp-Madore 417-391, but compiling a list of interesting candidates for the advanced space telescope is a necessary first step.Follow us
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