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

NASA’s Double Asteroid Redirection Test (DART) spacecraft will collide with an asteroid on Monday (Sept. 26), in the first-ever test of humanity’s ability to deflect life-threatening asteroids before colliding with Earth.

The 1,210-pound (550 kilograms) DART craft, a crouched cube-shaped probe consisting of sensors, an antenna, an ion thruster and two 28-foot-long (8.5 meters) solar panels, will impact the asteroid Dimorphos while traveling at about 13,420 mph (21,160 km/h).