Space rock, also known as cosmic rock or extraterrestrial rock, refers to any type of rocky object that originates from beyond Earth's atmosphere. Some synonyms for space rock include meteorite, asteroid, comet, or planetesimal. These different terms are used to describe various types of space rocks based on their size, composition, and origin. For example, meteorites are small rocks that have fallen to Earth from space, while asteroids are larger space rocks that orbit the Sun. Comets are icy bodies that originate from the outer Solar System, while planetesimals are small proto-planets that form in the early stages of planet formation. Understanding the different types of space rocks is important for studying the history and evolution of our Solar System.