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. ,

Space Definitions 1

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