You can watch all the action from NASA's Double Asteroid Redirect Mission (DART) live here at Space.com and on NASA TV, including on impact day (Sept. 26).
In the weeks leading up to the impact, you can also tune in to media briefings on the mission's goals and progress.
DART will slam into Dimorphos, the moonlet of a near-Earth asteroid called Didymos.
If successful, the spacecraft will alter the path of Dimorphos in its orbit around Didymos; just how much Dimorphos' orbit changes will be confirmed in the months and years after impact.
The mission aims to test out planetary defense methods in a safe environment, as the activities pose no threats whatsoever to Earth. Here's how you can follow the action live.
NASA plans to host a hybrid media day at the Applied Physics Laboratory "focused on the technology enabling the DART spacecraft to autonomously navigate to and impact its target asteroid.