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To be clear: Dimorphos doesn’t pose any threat to Earth, but the DART mission is the first physical test in space of one of NASA’s primary tenets: planetary defense.
When NASA's DART spacecraft crashes into the asteroid Dimorphos, it will be the first time we've deflected an object in space. It's a test to see how we'd defend Earth against asteroid impacts.
In the first-of-its kind, save-the-world experiment, NASA is about to clobber a small, harmless asteroid millions of miles away.
Diverting a planet-killing asteroid from striking Earth is the one natural disaster that can be prevented.
NASA has revealed the winners of its fourth annual Photographer of the Year awards revealing astonishing behind-the-scenes photos.