他们把望远镜转向附近的其他星系。
天文学家们发现了一个遥远的星系。
这就使得科学家推测还有其他星系存在。
This has led scientists to speculate on the existence of other galaxies.
星系往往聚集形成星团。
从该星系中心接收到的无线电信号证实了黑洞理论。
Radio signals received from the galaxy's centre back up the black hole theory.
这个定律被普遍认为同样适用于至少数十亿光年之远的星系。
This law is known to hold true for galaxies at a distance of at least several billion light years.
这是一个星系还是两个？
上图中几乎每一个模糊的黄色斑块都是一个完整的星系。
Almost every fuzzy yellow patch in the above image is an entire galaxy.
只有拥有球形膨胀物质的星系才可能容纳超大质量的黑洞。
Only galaxies with a spherical bulge—like component appear to accommodate supermassive black holes.
在一个给定的星系中，这些恒星的数量远远超过其他恒星。
These stars vastly outnumber the other stars in a given galaxy.
这一推理路线是一个令人兴奋的螺旋星系结构新理论的基础。
This line of reasoning underlies an exciting new theory of spiral-galaxy structure.
根据先前的推测，这些气体束是在一次星系的爆炸中炸出来的。
According to previous speculation, these strands were gases that had been blown out by an explosion in the galaxy.
这些星系可能为宇宙中长期存在的缺少重子质量这一谜题提供了答案。
These galaxies may constitute an answer to the long-standing puzzle of the missing baryonic mass in the universe.
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。
The physicist Fabian reasoned that as intergalactic gas cools, the cooler gas shrinks inward toward the center of the galaxy.
最终的结果是一股持续的气体流，开始是星系间的热气体，结束时是一股被称为“冷却流”的少量冷气体，落入星系中央。
The net result is a continuous flow of gas, starting as hot gases in intergalactic space and ending as a drizzle of cool gas called a "cooling flow," falling into the central galaxy.
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