NASA’s DART mission will move an asteroid and change our relationship with the solar system

The dinosaurs didn’t have a space agency; maybe if they did they’d still be here, would-be planetary defenders sometimes quip about their quest to avoid an asteroid impact. 

Planetary defense aims to identify any asteroids on track to cause serious damage to Earth and, should such a threat arise, act to deflect the rock. Such an impact is the only natural disaster that we can prevent, planetary defense experts often say. 

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