ejecta


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ejecta

(i-jek -tă) Material excavated during the formation of a crater or basin. See also ejecta blanket; secondary craters.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006

ejecta

[ē′jek·tə]
(geology)
Material which is discharged by a volcano.
(physiology)
Excrement.
(science and technology)
Material which is cast out.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Apparently, the radar energy's 6-meter wavelength penetrated deeply enough to detect mare material under the Plato and Iridum ejecta. In fact, by observing carefully near full Moon, you can see that dark mare lavas from Mare Frigoris embay some of this area.
Nevertheless, observed local normal faults along the inner ring together with radially sparse irregular blocks over flat terrains can be associated with terraced rimsor collapse of the inner crater structure and ejecta blanket, respectively (Hernandez et al., 2011).
The researchers specifically found two sites on Skye with suspected ejecta from that meteorite's crash, a little more than four miles apart from one another.
Microbial analysis shows that Indian flying fox ejecta are an amalgam of beneficial and pathogenic microbes and its pH (6.7 to 7.4), high concentration of phosphorus (4.50% and 4.33%) and nitrogen (3.26% and 2.37%) favor seed germination, enhance root growth and soil fertility.
It was shown by [60] that an SBO is likely present in all LGRB events, but for any realistic configuration the energy in the SBO pulse is lower by many orders of magnitude compared to those observed in the GRB prompt emission ([E.sub.SBO] = [10.sup.44]-[10.sup.47] erg, for reasonable estimates of the ejecta mass and progenitor radii).
The research, hinging on an "ejecta blanket" of material at the site, is revealed in a new TV show Walking Through Time.
Both craters are about the same size -- roughly 5 kilometers [3 miles] in diameter -- with similar appearances, including bright wisps or rays of ejected material, or ejecta. One apparent difference is that Organa has a central region of darker ejecta, though from the map created with data from New Horizons' Ralph/LEISA instrument, it appears that the ammonia-rich material extends beyond this dark area.
The baffle protects the screens from the muzzle blast and from extraneous ejecta, such as chunks of wads.
The 58 papers cover general descriptions, central systems, and evolutionary pathways; the galactic nova population; the extra-galactic nova population; nova ejecta; the spectroscopic evolution of a nova outburst; the optical observations of novae; infrared observations of novae; modeling nova outbursts; gamma-ray, X-ray, and radio observations of novae, symbiotic systems, novae and related objects, stella novae: future decades.
The authors suggest that searches for these impact ejecta layers will be more fruitful for determining how many times Earth was hit by big asteroids than searches for large craters.
Soon afterwards Arp came to the conclusion that quasars were ejecta from galaxies and that their redshift-derived motions were not of cosmological origin but instead were the result of high velocities caused by the ejection process.