Reddish hydrogen emission regions, called HII regions, are the regions of intense star formation seen to lie mainly along M51's bright spiral arms.
红色的氢发射区域，称为HII区域，是激烈的恒星形成区，主要沿着M51明亮的旋臂可见。
One result is that M101, also called the Pinwheel Galaxy, has several extremely bright star-forming regions (called HII regions) spread across its spiral arms.
其中一个结果就是被称为风车星系的M101内有数个极度明亮的恒星形成区域(也被成为HII区域)分布在星系的旋臂上。
One result is that M101, also called the Pinwheel Galaxy, has several extremely bright star-forming regions (called HII regions) spread across its spiral arms.
其中一个结果就是被称为风车星系的M101内有数个极度明亮的恒星形成区域(也被成为HII区域)分布在星系的旋臂上。
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