[Left] The boulder-covered moon Dimorphos as seen 8.55 seconds before the impact of the DART spacecraft. [Right] The same image after correcting for lighting conditions across the surface and shadows cast by boulders, revealing a fan-shaped pattern of streaks (highlighted in color for emphasis). Credit: NASA/JHU-APL/UMD Roughly 15% of asteroids that pass near Earth have a smaller companion orbiting them. These paired objects are known as binary asteroid systems, and they are surprisingly common