Photo: NASA/JPL/UMD/Michael Benson/Kinetikon Pictures
Our robot explorers aren’t always passive observers. In 2005 NASA’s Deep Impact space probe flew past the comet Tempel 1 and fired a projectile at the comet’s icy nucleus. The probe photographed the resulting cloud of dust and ice that expanded into space, and its spectrometers studied the chemical composition of the dust cloud.









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Eliza Strickland
Eliza Strickland is a senior editor at IEEE Spectrum, where she covers AI, biomedical engineering, and other topics. She holds a master’s degree in journalism from Columbia University.
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