NASA's 'Double Asteroid Redirection Test', or DART, has made impact with an asteroid. Here's what you need to know

If an asteroid was on a collision course with Earth, like the one that wiped out the dinosaurs, could we stop it?

That's what NASA's Double Asteroid Redirection Test is on a mission to find out.

The world's first full-scale mission to test technology for defending Earth against potential asteroid collisions has hit its target — now scientists will be watching closely to see if it worked.