Hypervelocity collisions can be studied by examining the results of naturally occurring collisions ( between micrometeorites and spacecraft, or between meteorites and planetary bodies ), or they may be performed in laboratories.
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During the extreme conditions created by an hypervelocity meteorite impact, near-surface terrestrial sediments and rocks were either melted, vaporized, or some combination of these and ejected from an impact crater.
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Alternatively, various mechanisms involving the dispersal of shock-melted material by an expanding vapor plume, which is created by a hypervelocity impact, have been used to explain the formation of tektites.
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"We believe Columbia was hit by a piece of electronic circuit board, " says Eric Christiansen, chief analyst at the Hypervelocity Impact Test Facility at the Johnson Space Center in Houston.
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This week scientists from the Open University and Oxford Brookes University will tell the Hypervelocity Impact Symposium in Galveston, Texas, that these particles, just a few micrometers across, pose a serious threat.
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Though the cost of power switching and other factors can limit projectile energy, a notable benefit of some coilgun designs over simpler railguns is avoiding an intrinsic velocity limit from hypervelocity physical contact and erosion.
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A thick lateral layer between the ( meta ) sedimentary Gunflint Iron Formation and overlying Rove Formation, and between the Biwabik Iron Formation and overlying Virginia Formation has evidence that the layer contains hypervelocity impact ejecta.
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Alumina aerogels are also being considered by NASA for capturing hypervelocity particles; a formulation doped with gadolinium and terbium could fluoresce at the particle impact site, with the amount of fluorescence dependent on impact energy.
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The material had to have been created in a hypervelocity impact between two large bodies; relative velocities at impacts less than 10 km / s would not transform the ubiquitous olivine and pyroxene into silica and SiO gas.
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Bond manages to access Hydt's research and development facility, where he uncovers plans for a weapon developed by Serbia known as " the Cutter ", which fires razor-sharp shards of titanium at hypervelocity.
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