Planet - A natural satellite that orbits a star, Moon - A natural satellite that orbits a planet, Star - A hot, bright ball of gas held together by gravity, Sun - The star at the centre of the Solar System, Universe - All of space and time, and the matter and energy they contain, Small Star - A star with less than 8 times the mass of the Sun, Prostar - A dense ball of gas that hasn't yet developed into a star, Supernova - An explosion of a red supergiant star, Plasma - A state of matter consisting of positive ions and free electrons, Photon - A particle of light or heat energy, Nuclear Reaction - A reaction in which an atom's nucleus changes, Nuclear Fusion - A nuclear reaction in which two atomic nuclei join together, Neutron star - The remains of the core of a large star, made of densely packed neutrons, Milky way - The galaxy in which the Solar System is located, Light year - A unit of length equal to the distance light travels in one year, Large star - A star with more than 8 times the mass of the Sun, Galaxy - A group of millions or billions of stars held together by gravity, Black Hole - An object that has gravity so strong that even light can't escape it, Big Bang - The origin of the universe,

Year 10 Universe Definitions

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