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EJECTA

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6

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8
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CTA
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4

1

21

86
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ACE
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  • 5 billion years ago in the early Hadean eon (about 20 to 100 million years after the Solar System coalesced), and the ejecta of the impact event later accreted to form the Moon.
  • Geologically, the astronauts noted the amount of glass contained in the regolith and present at the bottoms of shallow craters at the site, as well as lighter-colored regolith material that geologists later determined to be ejecta from Copernicus crater.
  • Fra Mauro is thought to have been formed from ejecta, or debris, from the impact which formed Mare Imbrium.
  • Rampart craters exhibit a fluidized ejecta flow after impact of the meteorite, most simply compared to a bullet fired into mud, with the ejecta resembling a mudflow.
  • Alternatively, it has been suggested that this terrain formed as a result of the convergence of ejecta at this basin's antipode.
  • They are built by ejecta from a volcanic vent, piling up around the vent in the shape of a cone with a central crater.
  • When viewed from orbit, Giordano Bruno is at the center of a symmetrical ray system of ejecta that has a higher albedo than the surrounding surface.
  • Over all of Mercury, the crispness of crater rims and the morphology of their walls, central peaks, ejecta deposits, and secondary-crater fields have undergone systematic changes with time.
  • This alder ejecta area is on spectrographic evidence instead principally anorthosite rock, typical of the lunar highlands.
  • Spitzer Space Telescope observations of the ejecta detected dust particles finer than human hair and discovered the presence of silicates, carbonates, smectite, metal sulfides (such as fool's gold), amorphous carbon and polycyclic aromatic hydrocarbons.
  • This wide separation relative to the pair's size is rather unusual and it is believed that both Esclangona and its moon are ejecta from an asteroidal collision in the past that left the scene as a co-orbiting pair; a similar pairing is 3749 Balam and its moon.
  • The inner region of the ejecta is characterized by a lobate appearance indicative of the flow of a liquid (or slushy) substance over the surface.
  • The ejecta, containing shocked minerals and small shatter cones, is composed of rock similar in age and composition to that at the crater, and is associated with an iridium anomaly suggesting contamination with extraterrestrial material.
  • Palynological data on its ejecta suggest Middle–Late Turonian age of the impact (about 90 million years ago).
  • Asymmetries in the crater structure and the ejecta blanket imply that the projectile impacted at low angle from the south-southeast.
  • Overlying this graben is a layer of breccia which is apparently the remains of an ejecta blanket that once surrounded the crater.
  • The impactor is suggested to have been a H chondrite asteroid based on ejecta layers from Italy, with the impactor thought to have been several kilometeres in diameter.
  • Based on cosmogenic nuclide exposure dating of the crater walls, the crater is less than 20 thousand years old, while the pristine state of preservation of the ejecta has been used to suggest that it may in fact be less than 4 thousand years old.
  • The impact created a large amount of ejecta which escaped Phobos' gravity and entered into orbit around Mars for a period not exceeding 1000 years, some of this material then crashed back onto Phobos and created secondary impact craters.
  • Most lateral transport of primary ejecta from impact craters is limited to a distance of a few crater radii, but some larger impacts, such as the impacts that made the Copernicus and Tycho craters, launched primary ejecta halfway around the moon.


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