Black-hole activity feedback is intensively studied on both galaxy-cluster scales and parsec scales. There are, however, many open questions about how the close surroundings of supermassive black holes affect large-scale structure and vice versa.

中文翻译：

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大规模的黑洞活动反馈

黑洞活动反馈在星系团尺度和秒差距尺度上都得到了深入研究。然而，关于超大质量黑洞的封闭环境如何影响大尺度结构以及反之亦然，仍有许多悬而未决的问题。