Celestial Body, A natural object in the sky., Planet, An object that does not undergo nuclear fusion but orbits one or more stars, called a natural satellite of a sun., Dwarf Planet, An object that orbits a star and is similar to a planet but is not large enough to clear its orbital path of debris., Exoplanet, A planet outside of our solar system that orbits a star/sun., Moon, A natural object that orbits a planet, or a natural satellite of a planet, Asteroid, Objects orbiting the sun that do not fulfil planetary criteria., Star, A large ball of hot gases/plasma that is undergoing nuclear fusion and emitting electromagnetic radiation., Sun, A star at the centre of a solar system., Solar System, One or more stars orbited by planets., Galaxy, A cluster of gravitationally bound stars, gas and dust clouds., Universe, Consists of many galaxies separated by empty space., Big Bang Theory, The rapid expansion of matter from a state of extremely high density (a singularity) and temperature which (according to current cosmological theories) marked the origin of the universe., The Age of the Universe, 13.8 billion years, Year, The time taken for an planet to orbit its sun., Day, The time taken for a celestial object to rotate on its axis.

Space Definitions 2

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