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NASA's DART spacecraft impacts asteroid in planetary defense demo [i]A NASA robotic probe has slammed into an asteroid and been destroyed. The spacecraft's sacrifice was in not vain, though — its loss may someday help save life on Earth. The Double Asteroid Redirection Test (DART) completed its mission on Monday (Sept. 26), ending its 10-month journey by crashing into Dimorphos, a "moonlet" of the asteroid Didymos. Its impact marked the the first time that a spacecraft autonomously navigated to a target asteroid and intentionally collided with it in a try at changing the rock's motion in a way that could be measured by telescopes back on Earth.[/i]
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