在这个又称为风车星系(Pinwheel Galaxy)的星系旋臂上，存在有好几个非常明亮的恒星形成区域。由于M101相当巨大，其巨大引力也会使得邻近较小星系发生扭曲变形 。
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Also known as the Pinwheel Galaxy, M101 lies within the boundaries of the northern constellation Ursa Major, about 25 million light-years away.
M101也被称为风车星系，位于大约2500万光年之遥的大熊星座北部边缘。
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。
Nicknamed the Southern Pinwheel, M83 is undergoing more rapid star formation than our own Milky Way galaxy, especially in its nucleus.
绰号“南方风车”的M83正在经历比我们银河系更快的恒星形成过程，特别是在它的核心。
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