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The key to planetary defense is finding them well before they are an impact threat, the principle with all of them is just to change the orbital speed of the asteroid just a small amount. Changing that speed of the asteroid in its orbit changes its orbit so in the future, it won't be in the same place it was going to be to impact the Earth.
Found on CNN 3 years ago
While no known asteroid larger than 140 meters in size has a significant chance of hitting Earth for the next 100 years, NASA and its partners are studying several different methodologies for deflecting a hazardous asteroid.
Found on CNN 5 years ago
DART would be NASA's first mission to demonstrate what's known as the kinetic impactor technique -- striking the asteroid to shift its orbit -- to defend against a potential future asteroid impact, this approval step advances the project toward an historic test with a non-threatening small asteroid.
Found on CNN 6 years ago
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