astrocenter

例句：

1. 1.The astrocenter of the galaxy is located at the center of the Milky Way.
   银河系的天体中心位于银河系的中心。
2. 2. Astronomers study the astrocenters of stars to understand their formation and evolution.
   天文学家研究恒星的天体中心，以了解它们的形成和演化。
3. 3.The astrocenter of the sun is the point where the Sun's gravity is strongest.
   太阳的天体中心是太阳引力最强的地方。