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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Planets are believed to emerge from the accretion of particles in a disk of gas and dust as they whirl around the star.

行星被认为是由围绕恒星旋转的气体和尘埃组成的圆盘中的粒子累积而成。

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Engineers working on sensors think this will eventually lead to "smart dust" -sensors as small as dust particles that can be dispersed on a battlefield, say, to spy on the enemy's movements.

致力于传感器的工程师认为这将最终导致“智能尘埃”的诞生，这是一种可被散布于战场上的尘埃微粒大小的传感器，用于暗中侦察敌方行动。

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

VOA: special.2009.09.30

The inhalation of these fine dust particles represents a health hazard that was known to the military as long ago as 1974.

BBC: UK to aid Iraq DU removal

Before people started making such a mess, the number of dust particles orbiting earth was tiny, since they would have been dragged quickly into the atmosphere by friction and burnt up.

ECONOMIST: Orbital debris

Collisions between the cosmic rays and the slower-moving protons that exist in the gas and the dust around a supernova should produce subatomic particles called neutral pions.

BBC: Cosmic rays: Fermi telescope settles mystery of origin