Planetoids, sometimes referred to as minor planets, are celestial bodies that orbit the sun but are smaller than the eight classical planets. They are also commonly known as asteroidoids, dwarf planets, or minor planets. Comets, which also orbit the sun, can sometimes be included under the umbrella term of planetoids due to their similar size and composition. Trans-Neptunian objects, which are found beyond the orbit of Neptune, can also be classified as planetoids. These objects are often studied by scientists to better understand the origin and evolution of our solar system.