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。
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。
As the comet nears the sun, its ice melts, releasing gas and dust that stream away into space.
当彗星靠近太阳时，它的冰层融化，释放的气体和尘埃飘向太空。
A comet is an icy body that releases gas or dust.
彗星是一个释放着气体和尘埃的冰质天体。
The catastrophe was caused by a disintegrating comet and saw the planet sprayed by thousands of frozen boulders made of ice and dust.
这次飞来横祸是由一颗彗星瓦解造成的，同时地球完全被无数由冰和尘埃组成的冰石所覆盖。
The Leonids are minute dust particles shed by Comet Tempel-Tuttle.
狮子座流星是由坦普尔·塔特尔彗星释放的微小尘粒构成。
NASA's Spitzer Space Telescope showing a band of dust around the bright star that strongly matches the contents-such as water ice, organics, and rock-of a comet busted apart in a collision.
nasa斯必泽太空望远镜的资料，资料显示这颗明亮的恒星周围环绕着一个尘埃带，其中的物质包含水冰、有机物和岩石，跟碰撞后粉碎的彗星物质极为相似。
When a comet gets close to the sun, melting ice releases pieces of dust, most no larger than grains of sand.
当彗星接近太阳时，它表面的冰壳开始融化分解成大大小小的碎片，大多数碎片并不会比沙粒更大。
As the comet nears the sun, its ice melts, releasing gas and dust that stream away into space. (Explore an asteroids and comets interactive.)
当彗星靠近太阳时，它的冰层融化，释放的气体和尘埃远远地飘向太空。(探索一颗小行星和彗星们的相互作用。)
At midnight, we found a cozy spot by the Charles River and gazed upward, watching for the stray dust of an ancient comet.
午夜时分，我们在查理斯河边找到了一个舒服的地方，仰望夜空，看着源自一颗古老彗星的飘散而过的尘埃。
The Japanese, like the Americans, have experience with sample-return of this sort, having flown a probe called Hayabusa that retrieved dust from the plume of a comet in 2010.
日本科学家和美国科学家一样，掌握相似的返回样本，曾在2010年利用探测仪隼鸟号从一颗彗星羽中检测到灰尘。
Dust from comet Swift-Tuttle is responsible for the Perseids, creating the northern hemisphere's regular summer sky show.
斯威夫特-塔特尔彗星撒下的尘埃形成的英仙座流星雨，为北半球的天空年复一年地带来盛大的夏日流星秀。
Meteor showers occur when the Earth passes through a trail of dust particles left by a comet.
在地球穿过彗星留下的尘埃颗粒的踪迹的时候，流星雨发生。
The fan-shaped region that stretches upward from Johnson's nucleus (yellow ball in the middle) represents the dust "tail" of the comet.
从Johnson彗星的彗核（照片中部的黄色球体）向上延展的扇状区域描绘出了这颗彗星的尘埃“尾”。
Dust tails are created when small particles from a comet are swept backward by the Sun's radiation pressure.
来自彗星的微小粒子被太阳辐射压向后推斥，形成尘埃尾。
The comet swings around the sun once every 33 years, leaving a trail of dust.
坦普尔·塔特尔彗星每隔33年接近太阳一次，留下一条长长的尘埃尾巴。
The comet swings around the sun once every 33 years, leaving a trail of dust.
坦普尔·塔特尔彗星每隔33年接近太阳一次，留下一条长长的尘埃尾巴。
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