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In a first test of its planetary defense efforts, NASA's going to shove an asteroid

An illustration of the DART spacecraft approaching two asteroids; it will crash into the smaller one to try to change how this space rock orbits its larger companion. (NASA/Johns Hopkins APL/Steve Gribben)
An illustration of the DART spacecraft approaching two asteroids; it will crash into the smaller one to try to change how this space rock orbits its larger companion. (NASA/Johns Hopkins APL/Steve Gribben)

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