An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian

A solid object with a mass about 10^-18-10^-15 kg in → interplanetary space that moves in hyperbolic orbit as a result of the solar → radiation pressure.

→ meteoroid.

A solid object in → interplanetary space before it reaches the Earth's atmosphere. Meteoroids are of → silicate and/or → metallic matter having a size from tiniest grains up to that of the smallest → asteroids.

→ meteor; → -oid.

The meteoroids distributed all along an → orbit and diffused somewhat around it.

→ meteoroid; → stream.

A relatively dense collection of meteoroids at certain spots along some → meteoroid streams.

→ meteoroid; → swarm.