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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