The term you are looking for is primarily associated with planet, moon, star, and galaxy.
- Planet: A celestial body that has enough mass to pull itself into a nearly round shape due to its own gravity.
- Moon: A natural satellite that orbits a planet and is also massive enough to be spherical.
- Star: A massive celestial body that generates energy through nuclear fusion, typically forming into a round shape.
- Galaxy: A large system of stars, gas, and dust held together by gravity, often takes on a specific shape but is larger and more complex than individual stars or planets.
Other terms—comet, meteor, meteorite, meteoroid, and asteroid—can vary in shape and do not necessarily have enough mass to pull themselves into a round shape. Comets and asteroids can be irregularly shaped, while meteoroids and meteorites are typically small fragments and are not considered massive enough to become spherical.
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