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A meteor or shooting star [8] is the visible passage of a meteoroid, comet, or asteroid entering Earth's atmosphere. At a speed typically in excess of 20 km/s (72,000 km/h; 45,000 mph), aerodynamic heating of that object produces a streak of light, both from the glowing object and the trail of glowing particles that it leaves in its wake.
Concentrations of trace elements (germanium, gallium and iridium) are used to separate the iron meteorites into chemical classes, which correspond to separate asteroid parent bodies. Chemical classes that include hexahedrites are: [4] IIAB meteorites (includes also some octahedrites) IIG meteorites
A chondrite / ˈ k ɒ n d r aɪ t / is a stony (non-metallic) meteorite that has not been modified by either melting or differentiation of the parent body. [a] [1] They are formed when various types of dust and small grains in the early Solar System accreted to form primitive asteroids.
Martian meteorites can be compared to analysis carried out by rovers (e.g. Curiosity). Meteorites can also be compared to spectral classes of asteroids. In order to identify the parent body of a class of meteorites, scientists compare their albedo and spectra with other known bodies. These studies show that some meteorite classes are closely ...
The meteorites have been described as "tuff" (compacted volcanic ash). [147] [29] As one example, the Tagish Lake meteorite provided ~10 kg of samples, from a meteor estimated to be 60–90 tons before entry. [148] By contrast, many ordinary chondrite meteorites are tougher [149] and overrepresented. [150] Iron meteorites are even moreso. [151]
The asteroid Kamo’oalewa—which in Hawaiian means “the oscillating fragment”—is a small (by asteroid standards) chunk of rock roughly the size of a ferris wheel. Its quasi-satellite ...
Few meteorites are large enough to create large impact craters. Instead, they typically arrive at the surface at their terminal velocity and, at most, create a small pit. NWA 859 iron meteorite showing effects of atmospheric ablation The impact pit made by a 61.9-gram Novato meteorite when it hit the roof of a house on 17 October 2012.
The Winchcombe meteorite is a rare and pristine carbonaceous chondrite, and it likely holds clues about early Earth's composition—and where our water came from.
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