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.
对于漩涡星系，如上图所示，通过氢发出的红色光，你很容易就能区分出旋臂内的恒星形成区。
In the case of the Whirlpool Galaxy, above, you can see exactly where along its great spiral arms it's presently forming stars, just from this red glow of the hydrogen!
对于分子量与淋洗体积曲线，星形PS- PI共聚物的臂数越多，向淋洗体积大的方向迁移得就越多；
As compared to polystyrene calibration curve, the migration trend of different number of arms of the star polymers was established.
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