Saturday, July 17, 2004
Granular eruptions
Researchers at the University of Twente in the Netherlands have created an experiment that beautifully demonstrates how sand can exhibit liquid-like properties. These photos are stills from a video the scientists recorded at 1,000 frames-per-second of a marble-size steel ball dropping onto loose, fine sand. The surreal footage may aid geophysicists in understanding what happens when an asteroid smashes into a planet. From the abstract of the scientific paper:
For a link to the movie of the experiment, scroll to the bottom of the page. Link"According to Shoemaker, the 'impact of solid bodies is the most fundamental process that has taken place on the terrestrial planets,' as they shape the surfaces of all solar system bodies. A lot of information on this process has been extracted from remote observations of impact craters on planetary surfaces. However, the nature of the geophysical impact events is that they are non-reproducible. Moreover, their scale is enormous and direct observations are not possible. Therefore, we choose an alternate and of course downscaled experimental approach in order to guarantee reproducible results."
posted by David Pescovitz at 04:37:17 PM permalink | Other blogs' comments
