Yahoo Web Search

  1. About 2,170,000 search results
  1. Martian meteorite NWA 7034, nicknamed "Black Beauty," weighs approximately 320 g (11 oz). 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. [update]

  2. Pages in category "Martian meteorites". The following 14 pages are in this category, out of 14 total. This list may not reflect recent changes ( learn more ). Martian meteorite.

  3. People also ask

    What is the name of the first Martian meteorite?

    Are there any meteorites that have landed on Mars?

    How old is the meteorite Northwest Africa 7034?

    How old are the shergottites meteorites on Mars?

  4. Northwest Africa 7034. Plagioclase and pyroxene phenocrysts in a fine groundmass. /  24.088517°N 14.777850°W  / 24.088517; -14.777850. Northwest Africa 7533 is a Martian meteorite believed to be the second oldest yet discovered. It is estimated to be two billion years old and contains the most water of any Martian meteorite found on Earth.

  5. Chassigny is a Mars meteorite which fell on October 3, 1815, at approximately 8:00 am, in Chassigny, Haute-Marne, France. Chassigny is the meteorite for which the chassignites are named, and gives rise to the "C" in SNCs. Chassigny is an olivine cumulate rock ( dunite ). It consists almost entirely of olivine with intercumulus pyroxene ...

  6. Allan Hills 84001 ( ALH84001) is a fragment of a Martian meteorite that was found in the Allan Hills in Antarctica on December 27, 1984, by a team of American meteorite hunters from the ANSMET project. Like other members of the shergottite – nakhlite – chassignite (SNC) group of meteorites, ALH84001 is thought to have originated on Mars.

  7. en.wikipedia.org › wiki › MeteoriteMeteorite - Wikipedia

    • Fall Phenomena
    • Classification
    • Chemistry
    • Weathering
    • Collection
    • in Human Affairs
    • Notable Examples
    • External Links

    Most meteoroids disintegrate when entering the Earth's atmosphere. Usually, five to ten a year are observed to fall and are subsequently recovered and made known to scientists. Few meteorites are large enough to create large impact craters. Instead, they typically arrive at the surface at their terminal velocityand, at most, create a small pit. Large meteoroids may strike the earth with a significant fraction of their escape velocity (second cosmic velocity), leaving behind a hypervelocity impact crater. The kind of crater will depend on the size, composition, degree of fragmentation, and incoming angle of the impactor. The force of such collisions has the potential to cause widespread destruction. The most frequent hypervelocity cratering events on the Earth are caused by iron meteoroids, which are most easily able to transit the atmosphere intact. Examples of craters caused by iron meteoroids include Barringer Meteor Crater, Odessa Meteor Crater, Wabar craters, and Wolfe Creek cra...

    Most meteorites are stony meteorites, classed as chondrites and achondrites. Only about 6% of meteorites are iron meteorites or a blend of rock and metal, the stony-iron meteorites. Modern classification of meteorites is complex. The review paper of Krot et al. (2007)summarizes modern meteorite taxonomy. About 86% of the meteorites are chondrites, which are named for the small, round particles they contain. These particles, or chondrules, are composed mostly of silicate minerals that appear to have been melted while they were free-floating objects in space. Certain types of chondrites also contain small amounts of organic matter, including amino acids, and presolar grains. Chondrites are typically about 4.55 billion years old and are thought to represent material from the asteroid belt that never coalesced into large bodies. Like comets, chondritic asteroids are some of the oldest and most primitive materials in the Solar System. Chondrites are often considered to be "the building b...

    In March 2015, NASA scientists reported that complex organic compounds found in DNA and RNA, including uracil, cytosine, and thymine, have been formed in the laboratory under outer space conditions, using starting chemicals, such as pyrimidine, found in meteorites. Pyrimidine and polycyclic aromatic hydrocarbons (PAHs) may have been formed in red giants or in interstellar dustand gas clouds, according to the scientists. In January 2018, researchers found that 4.5 billion-year-old meteorites found on Earth contained liquid water along with prebiotic complex organic substances that may be ingredients for life. In November 2019, scientists reported detecting sugar molecules in meteorites for the first time, including ribose, suggesting that chemical processes on asteroids can produce some organic compounds fundamental to life, and supporting the notion of an RNA world prior to a DNA-based origin of lifeon Earth.

    Most meteorites date from the early Solar System and are by far the oldest extant material on Earth. Analysis of terrestrial weatheringdue to water, salt, oxygen, etc. is used to quantify the degree of alteration that a meteorite has experienced. Several qualitative weathering indices have been applied to Antarctic and desertic samples. The most commonly employed weathering scale, used for ordinary chondrites, ranges from W0 (pristine state) to W6(heavy alteration).

    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". There are more than 1,100 documented falls listed in widely used databases, most of which have specimens in modern collections. As of January 2019[update], the Meteoritical Bulletin Databasehad 1,180 confirmed falls.

    Meteorites have figured into human culture since their earliest discovery as ceremonial or religious objects, as the subject of writing about events occurring in the sky and as a source of peril. The oldest known iron artifacts are nine small beads hammered from meteoritic iron. They were found in northern Egypt and have been securely dated to 3200 BC.

    Naming

    Meteorites are always named for the places they were found, where practical, usually a nearby town or geographic feature. In cases where many meteorites were found in one place, the name may be followed by a number or letter (e.g., Allan Hills 84001 or Dimmitt (b)). The name designated by the Meteoritical Societyis used by scientists, catalogers, and most collectors.

    Disintegrating meteoroids

    1. Tunguska event in Siberia1908 (no crater) 2. Vitim eventin Siberia 2002 (no crater) 3. Chelyabinsk eventin Russia 2013 (no known crater)

  1. People also search for