define galaxy.....................and pulley
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The Milky Way is the galaxy that contains our Solar System, with the name ... New view of the Milky Way with four clearly defined and symmetric spiral arms. Artist's conception of the spiral ...
The Milky Way is the galaxy that contains our Solar System, with the name ... New view of the Milky Way with four clearly defined and symmetric spiral arms. Artist's conception of the spiral ...Sun's Galactic rotation period
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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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