Fig. 1: Schematic representation of the DART mission.
From: Planetary defense with the Double Asteroid Redirection Test (DART) mission and prospects

The impact of the DART spacecraft into Dimorphos was observed by the LICIACube CubeSat and telescopes at the Earth and in space. As a result of the impact, Dimorphos’ orbit period was shortened and the mean distance from Dimorphos to Didymos was reduced. Credit: NASA/Johns Hopkins APL, adapted with permission.