The glowing comet dust grains are traveling at about 60 kilometers per second through the denser atmosphere around 100 kilometers above Earth's surface.

发光的彗星尘埃颗粒正以每秒60公里的密集的气氛中约100公里以上的地球表面。

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The comet dust is vaporized as it enters the atmosphere at upwards of 60 kilometers per second, producing visible trails that begin at altitudes of around 100 kilometers.

这颗彗星尘埃以每秒60多公里的速度闯入地球大气层，在大约100公里的高空开始产生肉眼可见的光迹。

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They combine with dust particles from the comet to form a huge cloud.

它们与来自彗星的尘埃颗粒结合在一起，形成了巨大的云团。

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A comet is a huge ball of frozen gas and dust that often releases a long trail of material as it nears the sun.

VOA: special.2009.09.30

A specially designed collector gathered dust particles from the comet and stored them on the spacecraft.

VOA: special.2009.09.30

On the main side, the front side of our ice cube tray, if you will, we exposed that when we flew past the comet, so we caught the comet dust.

NPR: Stardust Set to Deliver Comet Samples

So when we collect comet dust, we're actually collecting some stardust that was, you know, four and a half billion years old and was here when the solar system formed.

NPR: Stardust Set to Deliver Comet Samples

Sunday's eye-catching event occurred at the height of the annual Lyrid meteor shower, which happens every April as Earth plows through the dust and debris trailing a comet called Thatcher.

WSJ: Meteor Creates a Show, No Apparent Damage