One way to explain such twinning is in terms of impacts that reduced the ancestral body to a collection of rubble. A subsequent glancing blow by another asteroid might then have spun the rubble-pile, causing it to fly apart into two equal-size piles that still orbited their center of mass. It has also been hypothesized that the nearly 10% of large craters on Earth that are doublets (e.g. Clearwater Lakes Craters) were formed by the impact of binary asteroids (see Earth impact craters). This suggests that there could be a substantial number of binaries among the near-Earth asteroid population, and, moreover, that Earth may be the cause of these binaries in the first place. A rubble-pile asteroid passing close to Earth could be pulled apart by the planet's tidal force, then, at a later time, collide with Earth and create two nearly equal impact craters.
Related category ASTEROIDS AND OTHER MINOR PLANETS: TYPES AND GROUPS
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