星系中心恒星密集的椭球状区域，典型尺度为几千光年，主要成分是星族Ⅱ天体。
研究人员分析了从星系核球——即银河系的中心区域——搜集的微重力透镜研究数据。
The researchers examined data collected from microlensing surveys of what is called the Galactic Bulge, the central area of our own Milky Way.
在每个星系的中心几乎都存在一个超大质量的黑洞，而这个黑洞的周围又包围着一个大核球。
At its center, nearly every large galaxy contains a supermassive black hole surrounded by a big bulge of stars.
一般，超大型黑洞出现在体积、质量更大，含有核球的星系中。
Normally, supermassive black holes are found in much larger, much more massive galaxies that have bulges.
应用推荐