Messier number

例句：

1. 1.The Messier number is a measure of the angular momentum of an object.
   梅塞里数是衡量物体角动量的一个量度。
2. 2. The discovery of this new planet has raised questions about the nature of space and time.
   这一新行星的发现引发了对空间和时间本质的疑问。
3. 3.The Messier number is used in astronomy to determine the mass of stars.
   梅塞里数在天文学中被用来测定恒星的质量。