Asteroid collisions refer to the phenomenon of asteroids in space colliding with one another. This area of research examines the frequency, impact, and consequences of such collisions, which can have significant effects on the structure and composition of asteroids, as well as potentially pose threats to Earth if a large enough asteroid were to collide with our planet. Research in this area often involves the use of telescopes, satellites, and simulations to study the dynamics of asteroid collisions and their implications for planetary science and astronomy.