The physicist Fabian reasoned that as intergalacticgas cools, the cooler gas shrinks inward toward the center of the galaxy.
物理学家费边推断,当星系间的气体冷却时,较冷的气体向星系中心收缩。
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Meanwhile, its place is taken by hotter intergalacticgas from farther out on the edge of the galaxy, which cools as it is compressed and flows into the galaxy.