Survival of the weakest
Article Abstract:
New research indicates that many asteroid craters may be formed by material being crushed rather than explosively ejected. This research assumes that Asteroid Mathilde, the first outer-belt asteroid ever imaged, has a rubble-pile structure. However, it presents a new crater mechanism, indicating that extremely porous asteroids may accumulate rather than lose mass during collisions. If highly porous asteroids do crater by compaction, it may permit primitive asteroids to scoop up material, thus making planetary accretion easier to explain.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1999
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Hit-and-run planetary collisions
Article Abstract:
Colliding planets do not simply merge, as is commonly assumed but in many cases, the smaller planet escapes from the collision highly deformed, spun up, depressurized from equilibrium, stripped of its outer layers, and sometimes pulled apart into a chain of diverse objects. Remnants of these hit and run collisions are predicted to be common among remnant planet-forming populations, and thus to be relevant to asteroid formation and meteorite petrogenesis.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2006
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Once upon an asteroid
Article Abstract:
Research on Eros, an asteroid investigated by the NEAR-Shoemaker spacecraft, is examined in detail. The history and composition of Eros are explained.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2001
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