搜索 - 科创

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并且在早期的星系形态分类中被单独拎出来当做一类，比如在著名的哈勃音叉图，埃德温·哈勃将星系分为五大类，椭圆星系（elliptical galaxies）、无棒螺旋星系（unbarred spiral galaxies）、棒旋星系

这意味着银河系很可能是一种棒旋星系。另外，银河系是一个比较活跃的星系，银核有强烈的宇宙射线辐射，在那里恒星以高速围绕着一个不可见的中心旋转。这表明在银河系的核心有一个超大质量的黑洞。

星系按照外形分类，可分为椭圆星系，透镜星系，漩涡星系，棒旋星系，不规则星系椭圆星系：整体呈椭圆形，按照离心率从小到大分成E0-E7 8种，其中E0为正圆形，这种星系中年老的恒星较多，星云较少。

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