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Strictly speaking, a satellite collision is when two objects collide while in orbit around a third, much larger body, such as a planet or moon. This definition can be loosely extended to include collisions between sub-orbital or escape-velocity objects with an object in orbit. Prime examples are the anti-satellite tests by the USA and China (see below). == Natural-satellite collisions== To date, there have been no observed collisions between natural satellites of any Solar System planet or moon. Collision candidates for past events are: * Impact craters on many Jovian and Saturnian moons. They may have been formed by collisions with smaller moons, but they could equally likely have been formed by impacts with asteroids and comets during the Late Heavy Bombardment. * The far side of the Moon may have formed from the impact of a smaller moon that also formed during the giant impact event that created the Moon. * The objects making up the Rings of Saturn are believed to continually collide and aggregate with each other, leading to debris with limited size constrained to a thin plane. Although this is believed to be an on-going process, this has not been directly observed. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Satellite collision」の詳細全文を読む スポンサード リンク
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