A collision occurs when two or more objects come into contact with each other, often with force. This can happen in various situations, such as when cars crash on the road or when a baseball hits a bat. Collisions can cause damage to the objects involved and may lead to injuries for people nearby. In the natural world, collisions also happen on a larger scale. For example, when a meteor enters the Earth's atmosphere, it can collide with air particles, creating a bright streak of light known as a meteor shower. Understanding collisions helps scientists study everything from traffic safety to the formation of planets in space.