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A meteorite is a solid piece of debris from an object, such as a comet, asteroid, or meteoroid, that originates in outer space and survives its passage through the atmosphere to reach the surface of a planet or moon. When the original object enters the atmosphere, various factors such as friction, pressure, and chemical interactions with the atmospheric gases cause it to heat up and radiate energy. It then becomes a meteor and forms a fireball, also known as a shooting star; astronomers call the brightest examples "bolides". Once it settles on the larger body's surface, the meteor becomes a meteorite. Meteorites vary greatly in size. For geologists, a bolide is a meteorite large enough to create an impact crater.
Meteor Crater or Barringer Crater is a meteorite impact crater about 37 mi (60 km) east of Flagstaff and 18 mi (29 km) west of Winslow in the desert of northern Arizona, United States. The site had several earlier names, and fragments of the meteorite are officially called the Canyon Diablo Meteorite, after the adjacent Canyon Diablo.
A Martian meteorite is a rock that formed on Mars, was ejected from the planet by an impact event, and traversed interplanetary space before landing on Earth as a meteorite. As of September 2020, 277 meteorites had been classified as Martian, less than half a percent of the 72,000 meteorites that have been classified. The largest complete, uncut Martian meteorite, Taoudenni 002, was recovered in Mali in early 2021. It weighs 14.5 kilograms and is on display at the Maine Mineral & Gem Museum.
The Wold Cottage meteorite fell near Wold Cottage farm in 1795, a few miles away from the village of Wold Newton in Yorkshire, England.
Montezuma Castle National Monument protects a set of well-preserved dwellings located in Camp Verde, Arizona, which were built and used by the Sinagua people, a pre-Columbian culture closely related to the Hohokam and other indigenous peoples of the southwestern United States, between approximately AD 1100 and 1425. The main structure comprises five stories and about 20 rooms and was built over the course of three centuries.
The Wupatki National Monument is a United States National Monument located in north-central Arizona, near Flagstaff. Rich in Native American archaeological sites, the monument is administered by the National Park Service in close conjunction with the nearby Sunset Crater Volcano National Monument. Wupatki was established as a national monument in 1924 and was listed on the National Register of Historic Places on October 15, 1966. The listing included three contributing buildings and 29 contributing structures on 35,422 acres (14,335 ha).
A micrometeorite is a micrometeoroid that has survived entry through the Earth's atmosphere. Usually found on Earth's surface, micrometeorites differ from meteorites in that they are smaller in size, more abundant, and different in composition. The IAU officially defines meteorites as 30 micrometers to 1 meter; micrometeorites are the small end of the range (~submillimeter). They are a subset of cosmic dust, which also includes the smaller interplanetary dust particles (IDPs).
The Floian is the second stage of the Ordovician Period. It succeeds the Tremadocian with which it forms the Lower Ordovician epoch. It precedes the Dapingian Stage of the Middle Ordovician. The Floian extended from 477.7 to 470 million years ago. The lower boundary is defined as the first appearance of the graptolite species Tetragraptus approximatus.
Elden Pueblo was a prehistoric Native American village at the foot of Mount Elden near Flagstaff, Arizona. The pueblo is considered part of a major trading system. Various trade items, such as macaw skeletons from Mexico and shell jewelry from the coast of California, have been found throughout the site. The area is now protected and is used for research and educational purposes.
CI chondrites, also called C1 chondrites or Ivuna-type carbonaceous chondrites, are a group of rare carbonaceous chondrite, a type of stony meteorite. They are named after the Ivuna meteorite, the type specimen. CI chondrites have been recovered in France, Canada, India, and Tanzania. Their overall chemical composition closely resembles the elemental composition of the Sun, more so than any other type of meteorite.
Tuzigoot National Monument preserves a 2- to 3-story pueblo ruin on the summit of a limestone and sandstone ridge just east of Clarkdale, Arizona, 120 feet (37 m) above the Verde River floodplain. The Tuzigoot Site is an elongated complex of stone masonry rooms that were built along the spine of a natural outcrop in the Verde Valley. The central rooms stand higher than the others and they appear to have served public functions. The pueblo has 110 rooms. The National Park Service currently administers 58 acres, within an authorized boundary of 834 acres.
The Tissint meteorite is a Martian meteorite that fell in Tata Province in the Guelmim-Es Semara region of Morocco on July 18, 2011. Tissint is the fifth Martian meteorite that people have witnessed falling to Earth, and the first since 1962. Pieces of the meteorite are on display at several museums, including the Museum of Natural History of Vienna and the Natural History Museum in London.
Winonaites are a group of primitive achondrite meteorites. Like all primitive achondrites, winonaites share similarities with chondrites and achondrites. They show signs of metamorphism, partial melting, brecciation and relic chondrules. Their chemical and mineralogical composition lies between H and E chondrites.
IVB meteorites are a group of ataxite iron meteorites classified as achondrites. The IVB group has the most extreme chemical compositions of all iron meteorites, meaning that examples of the group are depleted in volatile elements and enriched in refractory elements compared to other iron meteorites.
The Zakłodzie meteorite is a stony-iron meteorite found in Poland in 1998. Its mass is 8.68 kilograms (19.1 lb). It is composed predominantly from enstatite and meteoric iron. Currently classified as an ungrouped enstatite achondrite its classification is still an ongoing scientific debate.
The Vermillion meteorite is a pallasite (stony-iron) meteorite and one of two members of the pyroxene pallasite grouplet.
Nonmagmatic meteorite is a deprecated term formerly used in meteoritics to describe iron meteorites that were originally thought to have not formed by igneous processes, to differentiate them from the magmatic meteorites, produced by the crystallization of a metal melt. The concept behind this was developed in the 1970s, but it was quickly realized that igneous processes actually play a vital role in the formation of the so-called "nonmagmatic" meteorites. Today, the terms are still sometimes used, but usage is discouraged because of the ambiguous meanings of the terms magmatic and nonmagmatic. The meteorites that were described to be nonmagmatic are now understood to be the product of partial melting and impact events and are grouped with the primitive achondrites and the achondrites.
Asteroidal water is water or water precursor deposits such as hydroxide (OH−) that exist in asteroids. The "snow line" of the Solar System lies outside of the main asteroid belt, and the majority of water is expected in minor planets. Nevertheless, a significant amount of water is also found inside the snow line, including in near-earth objects (NEOs).
CM chondrites are a group of chondritic meteorites which resemble their type specimen, the Mighei meteorite. The CM is the most commonly recovered group of the 'carbonaceous chondrite' class of meteorites, though all are rarer in collections than ordinary chondrites.
References
- ↑ M. K. Weisberg; T. J. McCoy; A. N. Krot (2006). "Systematics and Evaluation of Meteorite Classification". In D. S. Lauretta; H. Y. McSween Jr. (eds.). Meteorites and the early solar system II (PDF). Tucson: University of Arizona Press. pp. 19–52. ISBN 978-0816525621 . Retrieved 15 December 2012.
- ↑ "Winona". meteorites.com.au. Retrieved 5 December 2012.
- ↑ M. M. Grady Catalogue of Meteorites (5th ed.) Cambridge UP, 2000, p. 528.
- ↑ A. L. Christenson "J. W. Simmons' account of the discovery of the Winona meteorite."Meteorite10(3):14-16, 2004
- ↑ Heineman, R. E.; L. F. Brady (1929). "The Winona meteorite". American Journal of Science. 18: 477–486. Bibcode:1929AmJS...18..477H. doi:10.2475/ajs.s5-18.108.477.
- 1 2 Mason, Brian; Jarosewich, E. (31 May 1967). "The Winona meteorite". Geochimica et Cosmochimica Acta. 31 (6): 1097–1099. Bibcode:1967GeCoA..31.1097M. doi:10.1016/0016-7037(67)90083-X.