Universe, The sum total of everything, including many galaxies separated by empty space., Galaxy, A large cluster of stars, dust etc (eg the Milky Way)., Star, A large ball of matter that is undergoing nuclear fusion and emitting light and other forms of electromagnetic radiation. eg our sun., Solar System, One or more central stars orbited by planets., Planet, A large ball of matter that orbits a star. They do not emit their own light., Exoplanet, A planet existing around another star, outside of our solar system, Dwarf Planet, An object that orbits a star but is not large enough or roughly spherical enough to be classed as a small planet., Moon, A natural satellite of a planet.

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