NASA's DART spacecraft successfully slams into asteroid in historic test of planetary defense
It was a cosmic smash-up watched around the world.
A NASA spacecraft intentionally slammed into an asteroid Monday in a historic test of humanity's ability to protect Earth from a potentially catastrophic collision with a space rock.
The agency's DART probe, short for Double Asteroid Redirection Test, carried out the first-of-its-kind maneuver on a small and harmless space rock known as Dimorphos, which is about 6.8 million miles from Earth.
