1) Meteorite 2) Micrometeor 3) Micrometeoroid 1) Micro meteor 2) Micrometeoroid 
A micrometeorite is an extraterrestrial particle, ranging in size from 50 µm to 2 mm, collected on the Earth`s surface. Micrometeorites are micrometeoroids which have survived entry through the Earth`s atmosphere. They differ from meteorites in being smaller, more plentiful and different in composition and are a subset of cosmic dust, which als.....
The smallest type of object that reaches the surface of the Earth (or some other planet or moon) from space. Two varieties occur: cosmic spherules and interplanetary dust particles. The former are round and about 1 millmeter or less in diameter. Interplanetary dust particles are irregular in shape a...
A very small particle of interplanetary debris, too small to cause the luminous flash associated with meteors.
A meteorite less than 1 millimeter in diameter.
A small extraterrestrial particle that has survived entry into the Earth's atmosphere. The actual size is not rigorously constrained but is operationally defined by the collection procedure. Micrometeorites found on the Earth's surface are smaller than 1mm, those collected in the Stratosphere are rarely as large as 50 micro-m.
A meteorite less than 1 millimeter in diameter.
[n] - a meteorite so small that it drifts down to earth without becoming intensely heated in the atmosphere
micrometeoroid noun a meteorite or meteoroid so small that it drifts down to earth without becoming intensely heated in the atmosphere