A spacecraft is set to launch and test technology that may one day be needed to tip a dangerous asteroid off course.
Nasa’s Dart mission will evaluate a longstanding proposal for neutralising a sizeable space rock headed for Earth.
The spacecraft will crash into an object called Dimorphos to see how much its speed and path can be altered.
If a chunk of cosmic debris measuring a few hundred metres across were to collide with our planet, it could unleash continent-wide devastation.
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