define galaxy.....................and pulley
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define galaxy.....................and pulley
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Answer:
There are four main categories of galaxies:-
These types of galaxies are further divided into subcategories while at the same time other types of galaxies exist based on their size and other unique features.
A pulley is a wheel on an axle or shaft that is designed to support movement and change of direction of a taut cable or belt, or transfer of power between the shaft and cable or belt.