Planetary collisions, also known as planetary impact events, refer to high-energy collisions between celestial bodies such as planets, moons, asteroids, and comets. These events have played a crucial role in shaping the dynamics and evolution of our solar system and beyond. One of the most well-known examples of a planetary collision is the impact that is believed to have formed the Moon. The theory suggests that a Mars-sized object collided with Earth early in its formation, creating debris that eventually coalesced to form the Moon. Planetary collisions can also have significant implications for the habitability of a planet. Large impact events can cause mass extinctions, create new environments for life to emerge, or potentially even render a planet uninhabitable. Studying planetary collisions can therefore help us better understand the history and potential futures of not only Earth but other planets as well. Research in this field involves studying impact craters, analyzing the geochemical signatures of impact events, modeling collision dynamics, and exploring the potential for detecting and mitigating potential impacts in the future.