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A meteoroid (/ ˈ m iː t i ə r ɔɪ d / MEE-tee-ə-royd) [1] is a small rocky or metallic body in outer space. Meteoroids are distinguished as objects significantly smaller than asteroids, ranging in size from grains to objects up to 1 m (3 ft 3 in) wide. [2] Objects smaller than meteoroids are classified as micrometeoroids or space dust.
Its composition is similar to that of Ceres: high in carbon and silicon, and perhaps partially differentiated. [82] Pallas is the parent body of the Palladian family of asteroids. Hygiea is the largest carbonaceous asteroid [ 83 ] and, unlike the other largest asteroids, lies relatively close to the plane of the ecliptic .
These studies show that some meteorite classes are closely related to some asteroids. The HED meteorites for example are correlated with 4 Vesta. [2] Another, perhaps most useful way to classify meteorites by parent bodies is by grouping them according to composition, with types from each hypothetical parent body clustering on a graph. [3]
A "meteorite fall", also called an "observed fall", is a meteorite collected after its arrival was observed by people or automated devices. Any other meteorite is called a "meteorite find". [ 43 ] [ 44 ] There are more than 1,100 documented falls listed in widely used databases, [ 45 ] [ 46 ] [ 47 ] most of which have specimens in modern ...
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The composition of olivine and pyroxene in chondrules varies widely, although the range is usually narrow within any single chondrule. Some chondrules contain very little iron oxide (FeO), resulting in olivine and pyroxene that are close to forsterite (Mg 2 SiO 4 ) and enstatite (MgSiO 3 ) in composition.
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Porous chondrite dust particle. Cosmic dust – also called extraterrestrial dust, space dust, or star dust – is dust that occurs in outer space or has fallen onto Earth. [1] [2] Most cosmic dust particles measure between a few molecules and 0.1 mm (100 μm), such as micrometeoroids (<30 μm) and meteoroids (>30 μm). [3]