Meteorite so small that it falls to Earth essentially unchanged from how it existed in space. If a meteoroid entering the Earth’s atmosphere is sufficiently small (generally less than 10-6 m), it will be slowed by collisions with molecules in the upper atmosphere to a degree where ablation does not occur. Micrometeorites constitute almost all of the interplanetary debris entering the Earth’s atmosphere every day. They are commonly found in places where the terrestrial dust content is low, such as ocean floor sediments, Antarctic ice and in the stratosphere.

A small meteorite, typically of millimeter size.

Image source: http://en.wikipedia.org/wiki/File:Micrometeorite.jpg.

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