Dart: Mission to smack Dimorphos asteroid set for launch

A spacecraft tasked with crashing into an asteroid to test a future plan to save Earth will launch at 06:20 GMT.

Final preparations are under way in California for Nasa's Dart mission, which will evaluate if a space rock's speed and path can be changed.

The spacecraft will crash into a rock called Dimorphos - which does not pose a threat - to alter its course.