In fact, these panels show the location (circled) of Swift X-ray detected supermassive black holes in a variety of merginggalaxy systems.
事实上，上面的画面显示雨燕X射线天文台在多个星系合并系统中探测到的超大质量黑洞(圆圈)。
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That means when the two stars finally get around to merging, they could be far away from the galaxy of their birth — good news, as it happens, for optical confirmation.