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。
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。
Reddish hydrogen emission regions, called HII regions, are the regions of intense star formation seen to lie mainly along M51's bright spiral arms.
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