NASA has launched a spacecraft to smash into an asteroid and test whether it knocks it off course.
The DART spacecraft, short for Double Asteroid Redirection Test, lifted off from Vandenberg Space Force Base atop a SpaceX Falcon 9 rocket in a $330 million project.
If all goes well, in September 2022 it will slam head-on into Dimorphos, an asteroid 160 metres across across, at 15,000 mph.
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