The initial uniform magnetic field will wind into the spiral structures in the galactic disk, in which the magnetic field and the interstellar gas are frozen together.
初始均匀的磁场将缠卷而在星系盘中形成螺旋形的结构，其中磁场和星际气体是冻结在一起的。
The PHI looks at a different set of factors, such as whether the world has a rocky or frozen surface, whether it has an atmosphere or a magnetic field.
而行星的宜居指数（PHI）则考察另外的一组因素，如该星球是否有岩石或冰冻的表面，是否有大气层或磁场的存在。
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