M31(仙女星系)是本星系群中最大的旋涡星系。
M31 (Andromeda galaxy) is the biggest spiral in the Local Group.
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.
在本星系群或者宇宙的其他地方，矮星系都多于形状规则的大型星系同辈。
In the Local Group, as elsewhere in the Universe, however, dwarf galaxies outnumber their larger, shapelier cousins.
仙女星系是距银河最近的巨型旋涡星系，它以其所在星座仙女座命名，同时又被称为M31，它是本星系群中最大成员。
The nearest major spiral galaxy to the Milky Way, Andromeda, named after its constellation and also known as M31, is the largest galaxy in the Local Group of Galaxies.
由于所得的总引力质量低于过去的光学测量结果，我们推测群成员NGC 1400之所以具有极大的本动速度，很可能是因为它在星系群的引力势作用下尚未达到最终的平衡状态。
Since the obtained total mass is lower than those given in the earlier galaxy kinematic works, we speculate that NGC 1400 is not a virialized member in the group's gravitational potential well.
由于所得的总引力质量低于过去的光学测量结果，我们推测群成员NGC 1400之所以具有极大的本动速度，很可能是因为它在星系群的引力势作用下尚未达到最终的平衡状态。
Since the obtained total mass is lower than those given in the earlier galaxy kinematic works, we speculate that NGC 1400 is not a virialized member in the group's gravitational potential well.
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