When galaxies run into each other, they often appear to merge gracefully, their cores pirouetting around one another, drawn by their mutual gravitational attraction as their spiral arms extend outward in repose and their disks dissolve into an eternal embrace. But not in galaxy cluster PLCKG 287.0+32.9. Like a high-speed multi-car pileup in a HollywoodContinue reading “Galaxy cluster pileup sets record for the size of its glow”
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