meteoroid


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Related to meteoroid: meteor shower, meteoroid stream

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 ?
For the past eight years NASA astronomers have been monitoring the moon for signs of meteoroids crashing into the moon's surface and the space agency's lunar impact team has detected more than 300 strikes.
Most meteoroids that cause meteors are about the size of a pebble.
It took Saturn's rings acting like a giant meteoroid detector -- 100 times the surface area of the Earth-and Cassini's long-term tour of the Saturn system to address this question," Spilker added.
Real meteor showers are streaks of light produced by meteoroids, or tiny space fragments, as they bum up in Earth's atmosphere.
The Griffith Observatory in Griffith Park has, among exhibits on the moon and the planets, plenty of stats on asteroids and meteoroids.
As a result, Comet Swift-Tuttle produces a large number of meteoroids, many of which are large enough to produce fireballs," Mr Cooke explained.
The vast area encompassed by the rings acts like a giant net for catching meteoroids, which continually bombard the Saturn system.
It exploded in a flash nearly 10 times as bright as anything we've ever seen before," stated Bill Cooke from NASA's Meteoroid Environment Office.
It took Saturn's rings acting like a giant meteoroid detector -- 100 times the surface area of the Earth -- and Cassini's long-term tour of the Saturn system to address this question.
Tellingly, a massive EMP knocked out cell phones when the Chelyabinsk meteoroid hit.
It could have been a meteoroid or piece of man-made space junk, "or it could have been 100 other things that we haven't thought of," said mission manager Robert McBrayer.
html) chat live with Bill Cooke, head of NASA's Meteoroid Environment Office, during the event.