在理论上研究其形成和演化历史，同时与银河系进行比较将非常有利于进一步理解旋涡星系的形成和演化过程。
By studying the star formation history and chemical evolution of M31. and comparing with the Milky Way Galaxy, we are able to understand more about the formation and evolution of spiral galaxies.
两个环绕星系都类似于很久以前撞在一起形成巨型星系(如银河系)的较小星系，所以该发现有助于说明我们星系的构筑材料是如何形成和演化的。
Both satellite galaxies resemble the ones that smashed together long ago to create giant galaxies like our own, so the discovery helps illuminate how such galactic building blocks formed and evolved.
该发现揭示了现有关于此类双星系统形成和演化知识中的一段空隙。
The findings bring to light a gap in our knowledge of the formation and evolution of such binary star systems.
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