* Pianeta: The smallest of the listed objects. Pianeti Orbit stelle.
* Star: Stars are massive balls of hot gas that produce their own light and heat. They are much larger than planets.
* Sistema solare: A solar system is a collection of planets, moons, asteroids, comets, and other objects that orbit a star.
* Galaxy: A galaxy is a vast collection of stars, gas, dust, and dark matter held together by gravity. Le galassie sono molto più grandi dei sistemi solari.
* Cluster: A cluster is a group of galaxies bound together by gravity. Clusters are the largest of the listed objects.
So, the order from smallest to largest is:Planet, Star, Solar System, Galaxy, Cluster.
