Collisional family

In astronomy, a collisional family is a group of objects that are thought to have a common origin in an impact (collision).

They have similar compositions and most share similar orbital elements.

Known or suspected collisional families include numerous asteroid families,[1][2][3][4] most of the irregular moons of the outer planets, the Earth and the Moon,[5] and the dwarf planets Pluto, Eris, and Haumea and their respective moons.

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