Bennu boulders refer to the large rocks or formations found on the surface of the asteroid Bennu. Bennu is a near-Earth asteroid that was studied by NASA's OSIRIS-REx spacecraft, which conducted a sample return mission to collect and analyze samples of the asteroid's surface material. The study of Bennu boulders is important for understanding the asteroid's geology, composition, and history, as well as for identifying potential hazards to future spacecraft missions. By studying the boulders on Bennu, scientists can gain insights into the formation and evolution of asteroids in our solar system.