By discovering two interstellar objects (ISOs), we know that asteroids and comets from other star systems pass through the solar system from time to time. By inference, some of these must have crashed into the moon, creating impact craters. If we could study the impact sites, we might be able to learn about the star systems that they came from.
Click here for original story, Some of the moon’s craters are from interstellar impacts. Can we tell which?
Source: Phys.org