Star - Luminous sphere of mainly H and He gas held together by the force of gravity, Nuclear fusion - Many nuclei combine to form a larger nucleus and energy is released, Solar System - A star and all the celestial bodies that orbit the star, Planet - a) Orbits a star. b) large enough mass to be spherical. c) has a clear orbit, Comet - Large lumps of ice, gas and dust that orbit the Sun, Asteroid - Large lumps of rock and metal that orbit the Sun, Meteoroids - Smaller lumps of rock that orbit the Sun, Meteor - Meteoroid that has entered Earth's atmosphere, Meteorite - The remainder meteoroid that lands on Earth, Moon - Natural satellite that orbits a planet, Where asteroids are found - Asteroid belt between Mars and Jupiter, Where comets are found - Oort Cloud or Kuiper Belt, Galaxy - A system of stars, gas and dust held together by gravity,

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