meteoroid

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meteoroid:

see meteormeteor,
appearance of a small particle flying through space that interacts with the earth's upper atmosphere. While still outside the atmosphere, the particle is known as a meteoroid. Countless meteoroids of varying sizes are moving about the solar system at any time.
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meteoroid

(mee -tee-ŏ-roid) The collective term applied to meteoritic material in the Solar System, usually replaced by the terms micrometeorite for particles with mass less than 10–6 gram and meteorite for bodies with mass greater than about 105 grams. The majority of the mass of the meteoroid cloud around the Sun is made up of particles with individual masses between 10–7 and 10–3 gram. Meteoroids are usually produced by the decay of short-period comets and the collisional fragmentation of asteroids. In the main they move around the Sun in low-inclination direct orbits. The space density of meteoroids maximizes near the orbit of Mars and then falls off as 1/r 1.5, where r is the distance from the Sun. Individual meteoroids in the mass range 10–6 to 104 grams are fragile crumbly rocky dust particles with a composition similar to carbonaceous chondrite meteorites. See also meteor.

Meteoroid

 

a relatively small solid body that moves in outer space. The aggregate of meteoroids revolving around the sun forms the meteoric material in interplanetary space. Meteoroids are cometary debris or fragments of asteroids and in their motion occasionally encounter the earth and other planets.

meteoroid

[′med·ē·ə‚rȯid]
(astronomy)
Any solid object moving in interplanetary space that is smaller than a planet or asteroid but larger than a molecule.

meteoroid

any of the small celestial bodies that are thought to orbit the sun, possibly as the remains of comets. When they enter the earth's atmosphere, they become visible as meteors
References in periodicals archive ?
It is estimated that on entry the meteoroid weighed about a ton.
If any part of the meteoroid survives burning up and actually hits the Earth, that remaining bit is then called a meteorite.
Meteoroids are smaller than asteroids and spacebergs.
The new study suggests that some of the water-ice that may reside within permanently shadowed craters at the lunar poles could have come from within the moon rather than by delivery from comets and meteoroids.
If any part of the meteoroid survives burning up and hits the Earth, that remaining bit is then called a meteorite.
When: The shower hits its peak early Friday, but meteoroids will be more frequent than usual for several nights before and after.
Earth's atmosphere is an effective but selective screen that prevents smaller meteoroids from hitting Earth's surface," states the researcher.
When the Earth's orbit passes near or intersects these cosmic highways of space debris, we identify their relationship to Earth as three unique bodies: meteoroids (me-te-or-oids), meteors (me-to-ors) and meteorites (me-te-or-ites).
Meteoroids that have come from the trail left by Halley's Comet produce this display.
NASA should solicit more ideas for major space shuttle modifications, including additional efforts to protect the orbiters from meteoroids and space debris, the National Research Council says.
Factors that could cause actual results to differ include, but are not limited to, the manufacture or launch of ViaSat-1 or implementation of the satellite service business in a timely manner; the ability to realize the anticipated benefits of the ViaSat-1 satellite; cost overruns and schedule delays; difficulties in obtaining regulatory approvals; launch failure, damage or destruction during launch or improper orbital placement; potential satellite failures or performance degradations; and in-orbit risks including malfunctions and collisions with meteoroids, decommissioned spacecraft or other space debris.
As a result, Swift-Tuttle Comet produces a large number of meteoroids, many of which are big enough to produce fireballs.

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