Asteroid missions involve sending spacecraft to study and explore asteroids, which are small rocky bodies that orbit the Sun. These missions may involve flybys, rendezvous, landings, or sample return missions to study the composition, structure, and behavior of asteroids. The goal of asteroid missions is to better understand the origins and evolution of the solar system, as well as to potentially develop strategies for planetary defense against potential asteroid impacts on Earth. Some notable asteroid missions include NASA's OSIRIS-REx mission to the asteroid Bennu and Japan's Hayabusa2 mission to the asteroid Ryugu.