Dimorphos is no threat to Earth but it has been chosen to help prove that dangerous incoming rocks can be deflected by intentionally crashing something into them.
An illustration of NASA's DART spacecraft on a collision course with the asteroid Dimorphos. Pic: NASA/Johns Hopkins APLA NASA-built spacecraft will deliberately crash into an asteroid as part of a test mission later this month.
Dimorphos orbits Didymos in around 11 hours and 55 minutes but astronomers at NASA hope that Dart will destroy itself and cut about 10 minutes off this time.
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