star density

例句：

1. 1.The star density in this region is relatively low compared to other parts of the galaxy.
   这个区域的恒星密度与其他星系部分相比较低。
2. 2. The study of star density has important implications for understanding the formation and evolution of galaxies.
   研究恒星密度对于理解星系的形成和演化具有重要意义。
3. 3.The star density map shows a clear gradient from high to low density regions.
   恒星密度图显示了从高密度到低密度区域的明显梯度。