define galaxy.....................and pulley
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system of millions or billions of stars, together with gas and dust, held together by gravitational attraction.
a wheel with a grooved rim around which a cord passes, which acts to change the direction of a force applied to the cord and is used to raise heavy weights.
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Galaxy
A galaxy is a huge collection of gas, dust, and billions of stars and their solar systems, all held together by gravity.
Pulley
A pulley is a wheel that carries a flexible rope, cord, cable, chain, or belt on its rim.
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