Simultaneous impact and lunar craters |
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Authors: | Verne R Oberbeck |
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Institution: | (1) Space Science Division, Ames Research Center, NASA, Moffett Field, Calif., USA |
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Abstract: | The existence of large terrestrial impact crater doublets and Martian crater doublets that have been inferred to be impact
craters demonstrates that simultaneous impact of two or more bodies occurs at nearly the same point on planetary surfaces.
An experimental study of simultaneous impact of two projectiles near one another shows that doublet craters with ridges perpendicular
to the bilateral axis of symmetry result when separation between impact points relative to individual crater diameter is large.
When separation is progressively less, elliptical craters with central ridges and central peaks, circular craters with flat
floors containing ridges and peaks, and circular craters with deep round bottoms are produced. These craters are similar in
structure to many of the large lunar craters. Results suggest that the simultaneous impact of meteoroids near one another
may be an important mechanism for the production of central peaks in large lunar craters. |
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