Robot roamed moon's surface, seeking answers.

Meaning: The lunar rover moved around the surface of the moon, looking for information that could answer questions about the moon.

Choice of Words: Robot is a machine that can do tasks automatically. Roamed means to wander or move around freely. Moon's shows that the subject is about the moon. Surface is the outer layer of something. Seeking means to try to find something. Answers are the solutions to questions or problems.