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The outcomes of asteroid collisional evolution are presently unclear: are most asteroids larger than 1km size gravitational aggregates reaccreted from fragments of a parent body that was collisionally disrupted, while much smaller asteroids are collisional shards that were never completely disrupted? The 16km mean diameter S-type asteroid 433 Eros, visited by the NEAR mission, has surface geology...
A new synthesis of asteroid collisional evolution is motivated by the question of whether most asteroids larger than ~1 km size are strengthless gravitational aggregates (rubble piles). NEAR found Eros not to be a rubble pile, but a shattered collisional fragment, with a through-going fracture system, and an average of about 20 m regolith cover. Of four asteroids visited by spacecraft, none appears...
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