单词	impactor
释义	impactor /ɪmˈpaktə / noun chiefly Astronomy An object (such as a meteorite) which collides with another body.Small impactors deliver meteorites, while large ones infrequently wreak global devastation.... The impactor and comet will collide at 10.2km per second, releasing the energy equivalent of 4.4 tonnes of exploding TNT. Although dramatic images of the impact may be sent to Earth in near-real time by the Deep Impact spacecraft and its impactor, the spacecraft themselves have limited remote sensing capability.
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