Completing nearly a decade of comet exploration, NASA's Deep Impact mission was the most-traveled deep-space comet hunter of its time. The spacecraft visited two comets and captured images of two more ...
Embed <iframe src="https://www.npr.org/player/embed/4735606/4735607" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player"> NASA ...
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