本星系群
- local group of galaxies
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介绍了本星系群中最大的旋涡星系M31(仙女星系)的基本观测性质。
Observational properties of the largest Local Group spiral M31 ( Andromeda galaxy ) are presented .
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仙女星系(M31,NGC224)是本星系群中最大的旋涡星系,而且离银河系并不遥远,无疑为我们提供了有利的观测条件。
Andromeda galaxy ( M31 , NGC224 ) is the biggest spiral in the Local Group . Since it is not far from Galaxy , it provides us a unique candidate that the galaxy structure and morphology can be observed carefully .
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现在,我们来介绍一下明确属于本星系群的几个较小的成员星系。
For the moment let us describe the minor members that we are sure belong to the Local Group .
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这些数据可以计算出时空弯曲的程度,从而也可得出我们邻居,一个含有50个星系以上被称为本星系群的质量大小,我们银河系和仙女座都包含在这个星系群中。
That allowed them to calculate the deformation of spacetime , and thus the mass , of our stellar neighborhood , aka the Local Group - a group of more than 50 galaxies , in which the Milky Way and Andromeda dominate .