gravity - An attractive force that exists between objects with mass., mass - The amount of matter that an object contains., kilograms - The unit used for measuring mass., weight - The downward-pulling force on an object, due to gravity., Newton - The unit used for measuring weight., acceleration - The rate by which something increases in speed., natural satellite - A rocky or gaseous body which orbits a planet or the Sun., artificial satellite - A man-made object which orbits the Earth.,

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