define galaxy.....................and pulley
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galaxy is a gravitationally bound system of stars, stellar remnants, interstellar gas, dust, and dark matter. The word galaxy is derived from the Greek galaxias, literally "milky", a reference to the Milky Way.
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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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