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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。
NGC 6946 is bright in infrared light and rich in gas and dust, exhibiting a furious rate of star formation.
这个星系在红外线区域很明亮，富含气体和尘埃，这些都显示出恒星正以飞快的速度形成。
"This is a plausible model for the formation of the bright tracks on Mars," he said.
“这是火星上明亮尘暴痕迹成因的一种可信模型，”他说。
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