Sentences with word «ejecta»
tmt.org
«At no level in the core... is there evidence for a layer of impact ejecta or a tsunamite,» the authors contend.
«For reasons that we're not totally sure about, the same properties can arise from the scattering of rocky ejecta on the blocky terrain of young impact craters on the moon,» Campbell notes.
Update: On 16 October, NASA released an image of a faint ejecta plume observed by the LCROSS shepherding spacecraft.
The strong gravitational pull created by the high density of the planet means that when a meteor strikes the surface, the dust and vapor it spews in all directions, called ejecta, doesn't travel far.
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.
First trailer for Ejecta (Indiewire).
* Joanna Morgan will share results of modeling to determine more accurately the amount of sulfur and CO2 shot into the atmosphere, including a second phase of gas release when ejecta was re-vaporized.
«Based on the likely location of ice deposits during this period of Mars» history, and the amount of meltwater that could have been produced by Lyot ejecta landing on an ice sheet, we think this is the most plausible scenario for the formation of these valleys» said David Weiss, a recent Ph.D. graduate from Brown and the study's lead author.
But also new elements are created in the hot ejecta of the explosion, among them radioactive species such as 44Ti (titanium with 22 protons and 22 neutrons in its atomic nuclei) and 56Ni (28/28 neutrons / protons), which decay to stable calcium and iron, respectively.
«Our best guess is that prior to the explosion, the star cast off some shell of material, and the supernova ejecta later collided with this shell.»
With over 40 Solar - masses, extremely high luminosity, a variable spectra, and surrounding ejecta, it is classified as a Luminous Blue Variable like Eta Carinae, as an extremely large star that are now often regarded as the evolutionary link between main - sequence O stars and the more evolved, smaller but similarly explosive, Wolf - Rayet stars.
Such airborne volcanic ejecta, regardless of size, is called tephra.
In Crida and Charnoz's conception, that ejecta first flattened into a ring around the planet, which then spread out and coagulated into the moon.
«The asymmetry of the radioactive ejecta is more pronounced the larger the neutron star kick is,» he adds.
The streaks are odd in that they extend much farther from the craters than normal ejecta patterns, and they are only visible in thermal infrared images taken during the Martian night.
But spectral analysis of the LCROSS ejecta suggests silver's concentration is higher (Science, vol 330, p 468).
The Kamil Crater, however, has been well preserved, with the radial streaks of ejecta thrown out during impact still visible.
And yet, some of Mercury's craters have streaks of ejecta comparable in length to those found on the moon.
«Overcooling is most likely to happen when very fast and magnetically - organized ejecta from the sun rattle Earth's magnetic field,» said Knipp.
To explain the discrepancy, Tamara Goldin of the University of Vienna and Jay Melosh of Purdue University in Indiana studied how ejecta falling through the atmosphere might affect heat transfer from the top of the atmosphere to the ground.
«The actual ejecta themselves were getting in the way of the thermal radiation [in the atmosphere] and shielding the Earth,» Goldin told New Scientist.
Theory aside, MRO's spectrometer clearly identified the bright ejecta around one larger crater as water ice.
«Newly formed relativistic ejecta decelerate quickly as they interact with the interstellar medium in the galaxy.
«The deeper iron - rich ejecta is the last stuff that got out of the star, yet it's now the furthest from the center of the explosion,» Hughes says.
The fast rise of the light curves, subsequent decay, and rapid color evolution are consistent with multiple ejecta components of differing lanthanide abundance.
The researchers found that large impactors, in addition to excavating huge basins, sprayed ejecta over vast swaths of the lunar surface.
The large range of aluminum / magnesium in circumstellar corundum and spinel is considered to reflect various stages of back - reaction between condensed corundum and gaseous magnesium in cooling stellar ejecta.
That left the researchers with the idea that meltwater, produced when hot ejecta interacted with an icy surface, carved the Lyot valleys.
Based on data in part from MGS, researchers noted a lack of ejecta debris in the region as well as features that usuallly point to volcanism, such as «bathtub rings» created when lava recedes from the area.
These glowing ejecta are suspected to have been energized by a star that has now... Read more
The team speculated that the moon could be ejecta produced by a slow encounter that formed the bi-lobed asteroid, but emphasized the need for robust and accurate simulations.
It's this cosmic ejecta that alerts astronomers to the existence of these mysterious monsters.
No dust emission is seen from the nova ejecta.
While there was extensive ejecta deposits from the Rheasilvia impact, impact melt volume was low, and a spiral fracture pattern was created which is likely related to faulting during uplift and convergence of the basin floor.
arXiv • «Estimating the Contribution of Dynamical Ejecta in the Kilonova Associated with GW170817.»
Based on the amount of ejecta fading, researchers estimated the crater formed between 1980 and 1985, and believe it is the remains of an impact by a small hunk of rock a few feet in diameter.
It was assumed that tektites formed from the molten ejecta of high - energy impacts, but the question remained whether such impacts had taken place on the Earth or on the Moon or elsewhere in space.
Neither subject nor object, inside or outside, the abject is an interstitial state: a threshold space of fluid indeterminacy that both precedes and transgresses one's boundaries — hence its associations with contamination and bodily ejecta.
For Georges Bataille, abjection's other philosophical touchstone, the lowest of social ejecta — the lumpen — was also a privileged revolutionary agent.
However those cycles move in longer cycles of maximum and minimum energy ejecta (solar storms) during peak sunspot cycles.
Any rain related to the plume would have fallen after the rocky impact ejecta had been deposited outside the crater.