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Topic: Meteorite


In the News (Sat 25 Nov 17)

  
  Planets Zone, Rose Center for Earth and Space | American Museum of Natural History
The Willamette Meteorite is a rare and important scientific specimen that is preserved as part of the collections of the Museum's Department of Earth and Planetary Sciences.
In structure it is a metallic iron meteorite, weighing over 15.5 tons, the largest meteorite ever found in the United States, and the sixth largest meteorite in the world.
The microscopic structure of the meteorite is unusually complicated and suggests a unique set of events subsequent to its original formation, yet to be fully analyzed.
www.amnh.org /rose/meteorite.html   (400 words)

  
 Meteorite Stamps and Coins
One of the minerals, identified as "fer natif" (native iron) appears to be an etched slice of an iron meteorite displaying its Widmanstatten pattern.
The first sheet (left) depicts a Martian meteorite from India (presumably Shergotty), a Martian meteorite from Nigeria (presumably Zagami), a Howardite from the United States (five are known), the iron meteorite Mundrabilla from Australia, and a mesosiderite from Poland (presumably Lowicz).
The Pallas meteorite is sometimes called the "foundation stone" of meteoritics since analysis of its chemical composition afforded a basis for those claiming meteorites had an extraterrestrial origin.
www.pibburns.com /catastro/metstamp.htm   (8148 words)

  
  Meteoroids and Meteorites
Meteorites are bits of rock that are captured by a planet's gravity and pulled to the surface.
This meteorite is of a type named chondrite and is thought to have formed at the same time as the planets in the solar nebula, about 4.55 billion years ago.
This meteorite is assumed to be a sample of the crust of the asteroid Vesta, which is only the third solar system object beyond Earth where scientists have a laboratory sample (the other extraterrestrial samples are from Mars and the Moon).
www.solarviews.com /eng/meteor.htm   (1526 words)

  
  Meteorite - Wikipedia, the free encyclopedia
The only known examples of meteorites that didn't fall on Earth are Heat Shield Rock, which was found on Mars, and two tiny fragments of asteroids that were found among the samples collected on the Moon by Apollo 12 (1969) and Apollo 15 (1971) astronauts [1].
Meteorites have traditionally been divided into three broad categories: stony meteorites are rocks, mainly composed of silicate minerals; iron meteorites are largely composed of metallic iron-nickel; and, stony-iron meteorites contain large amounts of both metallic and rocky material.
The meteorites that struck this area were identified in the 1980s as Martian in origin.
en.wikipedia.org /wiki/Meteorite   (1226 words)

  
 Meteorite - MSN Encarta
Meteorites found on Earth are classified into types, depending on their composition: irons, those composed chiefly of iron, a small percentage of nickel, and traces of other metals such as cobalt; stones, stony meteors consisting of silicates; and stony irons, containing varying proportions of both iron and stone.
Although most meteorites are now believed to be fragments of either asteroids or comets, recent geochemical studies have shown that a few Antarctic stones came from the Moon and Mars, from which they presumably were ejected by the explosive impact of asteroids.
A meteorite that landed in Texas in 1998 was found to have water trapped in its rock crystals.
ca.encarta.msn.com /encyclopedia_761571891/Meteorite.html   (551 words)

  
 Learn more about Meteorite in the online encyclopedia.   (Site not responding. Last check: )
In the case of comet fragments, which are largely composed of ice, a considerable concussion may occur even though no fragment of the original meteoroid survives; the famed Tunguska event is thought to result from such an incident.
About 6% of meteorites are Iron meteorites with intergrowths of iron-nickel alloys, such as kamacite.
One theory stipulates that a large meteorite impact caused the mass extinction of the dinosaurs, as well as other mass extinction events throughout the history of the earth.
www.onlineencyclopedia.org /m/me/meteorite.html   (631 words)

  
 Willamette Meteorite, Rose Center for Earth and Space | American Museum of Natural History
However, the agreement also stipulates the Meteorite would be conveyed to the Tribe if the Museum failed to publicly display it, except for temporary periods for preservation, safety, construction and reasons beyond the reasonable control of the Museum.
The largest meteorite ever found in the United States, the Willamette is believed by scientists to be the iron core of a planet that was shattered in a stellar collision billions of years ago.
The Willamette Meteorite is the centerpiece of the Cullman Hall of the Universe in the Museum's recently opened Rose Center of Earth and Space.
www.amnh.org /rose/meteorite_agreement.html   (1198 words)

  
 Martian meteorite: Facts and details from Encyclopedia Topic   (Site not responding. Last check: )
A meteorite is a relatively small extra-terrestrial body that reaches the earths surface....
Heat shield rock is a basketball-sized iron-nickel meteorite found on mars by the mars rover opportunity in january 2005....
Alh84001 (a contraction of allen hills 1984 #001) is a meteorite found in allen hills, antarctica in december 1984 by a team of us meteorite hunters from...
www.absoluteastronomy.com /encyclopedia/m/ma/martian_meteorite.htm   (1709 words)

  
 Reference.com/Encyclopedia/Meteorite
A small number of meteorites belong to additional groups or subgroups with unique chemical characteristics relative to other members of the larger groups, such as Lunar meteorites or Martian meteorites.
One theory stipulates that a large meteorite impact caused the mass extinction of the dinosaurs.
It is also theorized that meteorites caused other mass extinction events as well throughout the history of the earth.The only reported fatality from meteorite impacts is an Egyptian dog who was killed in 1911, although this report is disputed.
www.reference.com /browse/wiki/Meteorite   (650 words)

  
 Lunar Meteorites   (Site not responding. Last check: )
The main thrust of his argument is that all the lunar meteorites were blasted off the Moon in the last ~20 million years (most in the last few hundred thousand years) and that there haven’t been enough “big” impacts on the Moon in that time to account for all the different lunar meteorites.
A weathered lunar meteorite would not be an impressive or suspicious looking rock if found in a cornfield or streambed (see Dar al Gani 400 or QUE94281) and a brecciated lunar meteorite could easily be overlooked in the field as a terrestrial sedimentary rock.
Lunar meteorites that are mare basalts (e.g., NWA 032) or breccias composed mainly of mare material (EET 87521/96008) are poor in aluminum and rich in iron.
epsc.wustl.edu /admin/resources/moon_meteorites.html   (4059 words)

  
 Orgueil meteorite
The research team then compared their results with three other meteorites: Murchison and Murray, which have been studied extensively, and Ivuna, a meteorite that fell in Tanzania, Africa, in 1938, that had not been analyzed for amino acids.
The Murchison and Murray meteorites were placed in a category containing a complex mix of amino acids made up of more than 70 different types of amino acids.
However, as in the case of other claims regarding extraterrestrial fossils aboard meteorites, this new piece of evidence is unlikely to be readily accepted by the scientific establishment until it can be rigorously shown that (a) the remains admit no non-biological interpretation, and (b) the possibility of terrestrial contamination can be absolutely ruled out.
www.daviddarling.info /encyclopedia/O/Orgueil.html   (1089 words)

  
 Cosmochemistry Group - Meteorite FAQS   (Site not responding. Last check: )
Meteorites are either stony, in which case they are only slightly heavier than a typical terrestrial rock of the same size, or they are metallic, in which case they are much heavier and may ring like a bell when struck with a metallic object.
Meteorites are important because they are as old as the Earth and the entire solar system and have compositions very similar to the Sun's.
Elizabeth Hodges, of Sylacauga, Alabama, was given a terrible bruise on the side by a falling meteorite in 1954, and a young boy was struck in the head by a meteorite that had been slowed down by the leaves of a banana plant in Uganda in 1992.
www.uark.edu /depts/cosmo/metfaqs.htm   (898 words)

  
 Meteorites, Meteorites and Impacts
One of the Martian meteorites, known as ALH84001 (left), is believed to show evidence of early life on Mars.
Included are all known meteorites (4660 in all, weighing a total of 494625 kg) in the period 1740-1990 (excluding meteorites found in Antarctica).
Was it a comet or an asteroid that caused the Chicxulub crater in the Yucatan (and probably caused the extinction of the dinosaurs)?
seds.lpl.arizona.edu /nineplanets/nineplanets/meteorites.html   (1499 words)

  
 Meteorite Hunters: Marvin Killgore
Some meteorites annihilate themselves in massive explosions close to the ground, causing flashes of heat that are hot enough to melt the sand into pure glass.
The first meteorite that Killgore found -- after he had been given tentative approval to classify his own meteorites -- was a rare type that was very challenging to classify because there were very few specimens like it.
They are probably the plainest-looking meteorites, but they are among the most interesting because of their possible link to the origins of life.
www.space.com /peopleinterviews/mkillgore_000503.html   (1589 words)

  
 UCLA - Earth and Space Sciences - Cosmochemistry
Throughout atmospheric passage, the interior of the meteoroid remains cold and the internal structure and composition of the rock is unaffected.
Meteorites may vary in weight from a few grams to many tons, but most weigh a few kilograms and are about 5-50 cm in length.
Iron meteorites have a very high density and weigh about three times as much as earth rocks of similar size; most stony meteorites weigh about one and a half times as much as comparably sized earth rocks.
www.ess.ucla.edu /research/cosmochem/meteorite.asp   (1128 words)

  
 Found A Meteorite? (Meteorite Identification Information & Help) - Meteorites Australia
When a meteorite is sliced or broken, the exposed interior surface is often referred to as the "matrix".
Sometimes in weathered or broken meteorites, the chondrules may be exposed and evident on the surface.
All verified meteorites require extensive testing and study from an approved institution to be formally classified and approved as such.
www.meteorites.com.au /found.html   (1511 words)

  
 Some Meteorite Realities
Among meteorites of which I'm aware, MIL 05035 (an unbrecciated basalt) has the most elongated minerals; see photomicrograph.
It is exceedingly rare for the aspect ratio of a clast in a brecciated meteorite to exceed 3-to-1.
On the other hand, Winston Churchill is alleged to have said (about something completely different), "There are a terrible lot of lies going around the world, and the worst of it is half of them are true." Compromise: I admit that all of these statements are untrue some of the time.
meteorites.wustl.edu /realities.htm   (1267 words)

  
 Meteorites: Zoom Astronomy
Meteorites have survived a fiery fall through the Earth's atmosphere and have lost a lot of mass in that process.
Most meteorites burn up in the Earth's atmosphere; all that is left is a bit of dust.
The largest meteorite ever found in the United States is Willamette meteorite (named for the city in Oregon where it landed).
www.enchantedlearning.com /subjects/astronomy/meteor/meteorite.shtml   (320 words)

  
 CNN - Ancient meteorite may point to life on Mars - Aug. 7, 1996
Scientists believe the meteorite was blasted away from Mars by the impact of asteroids, and landed on Earth.
Scientists who have studied the meteorite say it bears chemical markers that may be evidence of biological activity.
If the meteorite found in Antarctica is billions of years old, it dates from the earliest days of Mars, at the time the planet formed.
www.cnn.com /TECH/9608/06/mars.life   (690 words)

  
 Meteorites, Meteorites and Impacts
One of the Martian meteorites, known as ALH84001 (left), is believed to show evidence of early life on Mars.
A "fall" means the meteorite was witnessed by someone as it fell from the sky.
Included are all known meteorites (4660 in all, weighing a total of 494625 kg) in the period 1740-1990 (excluding meteorites found in Antarctica).
www.nineplanets.org /meteorites.html   (1499 words)

  
 Exploring The Planets - Mars Meteorite
It is one of the SNC meteorites, which are named after three locations where this rare type of meteorite was first found: "S"hergotty (India), "N"akhla (Egypt), and "C"hassigny (France).
Analysis showed that the composition of this gas was nearly identical to that of the atmosphere on Mars, as measured by the Viking Landers in 1976.
It concentrates the meteorites in regions where the flow is obstructed by hills, and where wind and evaporation rapidly remove the ice and snow.
www.nasm.si.edu /ceps/etp/mars/marsrock.html   (578 words)

  
 How To Identify a Meteorite
Meteorites are pieces of asteroids and other bodies like the moon and Mars that travel through space and fall to the earth.
Meteorites without metal in them are extremely rare and they need to have some of the other characteristics of meteorites to be able to identify them as meteorites.
If a meteorite is found on federal lands, then government officials consider it to belong to the government and, under an interpretation of the 1906 "Antiquities Act," meteorites found on federal lands belong to the Smithsonian Institution.
epswww.unm.edu /iom/ident   (2185 words)

  
 MIAC - Iron Meteorites   (Site not responding. Last check: )
This meteorite was found in 1916 about 10 km north of Annaheim, a settlement somewhat about 100 km east of Saskatoon.
This meteorite from Chihuahua, Mexico is a medium octahedrite with an original mass of 1547 kg.
Three masses (38.6 kg, 18.6 and 10.6 kg) of this stony iron pallasite were found near the Saskatchewan town of Springwater (120 km west of Saskatoon) in 1931.
miac.uqac.ca /MIAC/iron.htm   (299 words)

  
 AMS Fireball and Meteorite FAQ
Meteorites are known to fall as single, discreet objects; as showers of fragments from a meteor which breaks up during the atmospheric portion of its flight; and (rarely) as multiple individual falls.
Meteorite hunters often employ metal detectors, or very strong magnets attached to a walking stick, to aid them in their searches.
Stony meteorites from this source are called Chondrites, due to the rounded nodules of material found within their structure, which are called chondrules.
www.amsmeteors.org /fireball/faqf.html   (5122 words)

  
 Yukon meteorite recovered!   (Site not responding. Last check: )
Scientists say the meteorite was a carbonaceous chondrite, a rare type of space rock that contains many forms of carbon and organics, basic building blocks of life.
Carbonaceous chondrites, which comprise only about 2 percent of meteorites known to have fallen to Earth, are typically difficult to recover because they easily break down during entry into Earth's atmosphere and during weathering on the ground.
The Murchison meteorite, pictured here, has fascinated students of life's origins since 1970, when investigators discovered that the rock is rich in amino acids and other complex organic compounds.
spacescience.com /headlines/y2000/ast16mar_1.htm   (866 words)

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