人马座A Sagittarius A
（重定向自Sgr A）
人马座A（Sagittarius A或简写Sgr A）是位于银河系银心的复杂无线电波源。它位于人马座，在可见光观测下被银河系螺旋形袖子的大幅宇宙尘所屏蔽。
人马座A由3个部份组成：超新星遗迹的人马座A东星、螺旋结构的人马座A西星、及非常光亮的致密无线电波源人马座A*。这三个部份是重叠的，当中人马座A东星最大，西星位于东星内偏离中心的位置，而A*则位于西星中心。
Sgr A
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Sagittarius A 人马座A
（重定向自Sgr A）
![Astronomers have observed stars spinning around the supermassive black hole in Sagittarius A*.[3]](/uploads/202502/10/A_monster_in_the_Milky_Way4547.jpg)
Sagittarius A or Sgr A is a complex radio source at the center of the Milky Way. It is located in the constellation Sagittarius, and is hidden from view at optical wavelengths by large clouds of cosmic dust in the spiral arms of the Milky Way.
It consists of three components, the supernova remnant Sagittarius A East, the spiral structure Sagittarius A West, and a very bright compact radio source at the center of the spiral, Sagittarius A*. These three overlap: Sagittarius A East is the largest, West appears off-center within East, and A* is at the center of West.