这种假设或许可以解释为什么活跃星系中只有10%存在喷流，以及它们如何持续演变。
This scenario may explain why only 10% of active galaxies have radio jets, and how active galaxies evolve over time.
许多星系都呈现出双泡状物质喷流并且伴有核心区域喷发出的能量，不过“费米气泡”已然超越了这种简单的解释。
Lots of galaxies exhibit two-lobed jets of matter and energy erupting from their cores, but the "Fermi bubbles" defy easy explanation.
但问题是，这仅仅是M 87过去的行为还是它将会发生在每个活动星系核或者单个喷流中？
But the question is, does this happen to every single jet or active nucleus, or are we seeing some odd behavior from M87?
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