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Why DART is a mover and shaker in asteroid planetary defense: NASA science chief

NASA's science chief says a spacecraft plunging towards an asteroid will be a big hit for planetary defense.

The Double Asteroid Redirection Mission (DART) is on a collision course with the asteroid moonlet Dimorphos and will arrive later today (Sept. 26). The spacecraft will broadcast its final few minutes live, which you can see here at via NASA.

The mission is the first-ever demonstrator of kinetic impact. That's one method by which we can nudge threatening asteroids out of the way, Thomas Zurbuchen, NASA's associate administrator for the science mission directorate, told

"When it comes to the asteroid defense business, it's really hard to do that in space," Zurbuchen said, noting NASA chose the double asteroid system because it's slightly easier to move an asteroid moonlet than the parent asteroid, called Didymos.

The agency expects to see "minute changes" in the moonlet's orbit, which Zurbuchen said is important in the long run, since the tiny differences would add up over time and — in theory — prevent a collision with Earth. "We're really excited every time our space missions protect life on Earth," he said.

NASA, the agency's science chief said, is always on the lookout for asteroids and this mission will add to the ongoing search since it will teach engineers how to "deflect and defend" against those objects. Happily, however, there is no imminent threat.

"We are not aware of a single object that's on a collision course in the next 100 years or so," Zurbuchen said, but noted that the agency is still searching for roughly half of all objects larger than 450 feet (140 meters) but smaller than 0.6 miles (1 kilometer) wide.

And just in case, it never hurts to be prepared. "We really want to get the tools together to defend against that," Zurbuchen said. "[DART] is the appropriate level of attention at the appropriate level of investments for this innovative mission. Tonight we'll make history."

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