How big is the asteroid threat, really?
NASA will try out planetary defense technology with its Double Asteroid Redirection Test (DART) this month, but don't worry — it's not because a space rock is just about to hit us.
TroibNews 
NASA will try out planetary defense technology with its Double Asteroid Redirection Test (DART) this month, but don't worry — it's not because a space rock is just about to hit us.
