star - A huge ball of gas that radiates energy produced in fusion reactions., planet - A large body in space that orbits the sun, is spherical and has cleared its orbit. The Earth is a planet., dwarf planet - A rocky body orbiting the Sun in an uncleared region that is not quite big enough to be called a planet (e.g. Pluto)., natural satellite - Anything that orbits a planet and has not been made by humans., moon - A natural satellite of a planet., comet - A small lump of dirty ice orbiting the Sun., asteroid - A small lump of rock orbiting the Sun., artificial satellite - A satellite made by humans., orbit - The path taken by a planet around the Sun or a satellite around a planet., elliptical - A shape like a squashed circle., geocentric - Earth-centred., heliocentric - Sun-centred., telescope - An instrument that is used to gather light from distant objects and make them look bigger., gravitational field strength (g) - A measure of how strong the force of gravity is somewhere. The units are newtons per kilogram., weight - The force pulling an object downwards. It depends on the mass of the object and g. The units are newtons (N). Weight is a vector quantity.,

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