黑洞并非只会吞噬物质，尤其是旋转的超大质量黑洞，反而能成为宇宙中极强的“加速器”。
当气体落入黑洞形成吸积盘时，强大的磁场与等离子体相互作用能够把旋转能和引力势能抽取出来，沿着磁场线产生相对论性喷流，把带电粒子加速到接近光速——这类过程可由Blandford–Znajek机制和磁流体动力学解释。
除此之外，佩洛斯（Penrose）过程与引力弹弓效应也能在黑洞附近把单个粒子的能量显著提升。
观测上，类星体与活动星系核显示出窄而高速的射流，并伴随强烈的X射线与伽马射线辐射，证明了这些加速机制的存在。
黑洞加速不仅关联宇宙高能射线来源，也是研究强引力、电磁场耦合与相对论流体动力学的天然实验室。
随着事件视界望远镜与数值模拟的发展，我们将更清楚地看到黑洞如何高效地把局部能量转换为高速粒子流，进而影响星系尺度的能量输送与演化。
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