Nasa has successfully crashed a spaceship into an asteroid in the first ever "planetary defence test," clearing the way to perhaps one day save humanity from extinction.
The mission was the first attempt to alter the movement of a celestial body. It was intended to prove that it is possible to change the course of any future doomsday space rock threatening to obliterate Earth.
The historic test, which has been compared to the plot of the Hollywood movie "Armageddon," involved sending a $325 million spacecraft called DART [Double Asteroid Redirection Test] on a 10-month kamikaze journey.
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