Cosmic collisions refer to the interactions and collisions between celestial bodies in space, such as galaxies, stars, planets, and asteroids. These collisions can have a major impact on the evolution and dynamics of the universe, influencing the formation of new stars and galaxies, the distribution of matter in space, and the creation of new elements through nuclear fusion. Researchers study cosmic collisions using various tools and techniques, including computer simulations, observations with telescopes and other instruments, and analysis of cosmic debris and remnants. Understanding these collisions can provide insights into the origins and evolution of the universe, as well as help us predict and prepare for potential impact events that could affect Earth in the future.