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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