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micrometeoroid
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- An extremely small meteoroid, typically the size of a grain of dust. Particles measuring less than 0.05 mm (0.002 inch) in diameter are classed as micrometeoroids. Despite their small size, their high velocities mean that micrometeoroids pose a significant threat to spacecraft and artificial satellites.
- â—† A micrometeoroid that reaches the surface of the Earth, the Moon, or another celestial body is called a micrometeorite . The tiny size of micrometeoroids allows them to radiate away the heat generated by friction with the atmosphere, with the result that the proportion of micrometeoroids becoming micrometeorites is greater than the proportion of meteoroids becoming meteorites.
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Example Sentences
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The 'solar wind' of high energy particles from the sun and bombardment by micrometeoroids cause changes known as space-weathering.
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These melt splashes were created when micrometeoroids of cometary dust bombarded Ryugu.
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One is that micrometeoroid dust pollutes and darkens the rings’ pristine water ice.
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"No country in the world has a surveillance system capable of tracking micrometeoroids of this size - about 1 millimetre."
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The spacecraft’s mission is to provide a trip home for a trio of Russian and American astronauts whose original ride was damaged during what was probably a micrometeoroid strike in December.
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