NASA will crash its DART spacecraft into an asteroid on Monday. Here’s how to watch.

NASA’s Double Asteroid Redirection Test (DART) spacecraft is set to smash into an asteroid on Monday (Sept. 26), in the first-ever test of humanity’s ability to scatter life-threatening space rocks before they hit Earth.

The 1,210 lb (550 kg) DART, a squat cube-shaped probe consisting of sensors, an antenna, ion thruster and two solar arrays, will collide in asteroid Dimorphos while traveling at 13,420 mph (21,160 km/h).