The scientists discovered that the SPT2215 had not merged with other clusters in the last billion years.
“The fact that this cluster is so massive, so early in the universe suggests a really exciting, fast formation history. Yet the fact that it is relaxed suggests the opposite. It would be like finding a tidy kitchen right after the dinner rush,” said Lindsey Bleem of the U.S.
Galaxy clusters expand throughout time by merging with other galaxy clusters, and when no such mergers occur, they get ample time to "relax" in between. When this happens, the gas depicts a "calm appearance" — as seen in the SPT2215.
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