Wiktionary
n. (context astronomy geology English) an extraterrestrial particle less than a millimeter in size
WordNet
n. a meteorite or meteoroid so small that it drifts down to earth without becoming intensely heated in the atmosphere [syn: micrometeorite, micrometeor]
Wikipedia
A micrometeoroid is a tiny meteoroid; a small particle of rock in space, usually weighing less than a gram. A micrometeorite is such a particle that survives passage through the Earth's atmosphere and reaches the Earth's surface.
Usage examples of "micrometeoroid".
Sea of Tranquility will crumble under micrometeoroid bombardment in a mere half million years or so.
And judging by the cosmic ray and micrometeoroid damage to the exterior, it must have drifted in space for a very long time before that.
This time she wore a pressure suit and orange micrometeoroid overalls.
The micrometeoroid count alone was several orders of magnitude higher than in open space.
This close to the mirror it was possible to see imperfections in its surface - micrometeoroid punctures and places where the coating had flaked off over the years.
The PSPT layer was for micrometeoroid protection, a final fail-safe for the station in case the station-keeping deflectors went off-line.
It will then deploy two large arrays of solar cell panels attached to the sides of the stage, and raise an aluminum micrometeoroid shield that extends the length of the hydrogen tank.
Sea of Tranquillity will crumble under micrometeoroid bombardment in a mere half million years or so.
The heavy projections, cracked by the cold of interstellar space and eroded by centuries of dust and micrometeoroid impact, were what had once been the legs.
On the outside she remained a hundred-meter spheroid, its smoothness broken by airlocks, hatches, boat bays, instrument housings, communications boom, grapples, and micrometeoroid pocks that had given the metal a matte finish.
Ordinarily, these sensors were employed to detect potential flight hazards such as micrometeoroids or other debris.
It would be from this shell that billions of micrometeoroids would form.
On the Moon, though, the surface is dangerous: big temperature swings between sunlight and shadow, ionizing radiation constantly sleeting in from the Sun and stars, micrometeoroids peppering the ground and sandpapering everything exposed to them.
All the others that went before it were like micrometeoroids to a star.
Like most lunar manufacturing facilities, Factory Eleven was built out on the surface, open and exposed to the vacuum, protected against the constant rain of micrometeoroids only by a thin dome of honeycomb metal.