a³‐b³ =(a‐b)³+ ‐‐‐‐‐‐‐‐‐‐‐‐
3a(a+b)
3ab(a‐b)
-3ab(a+b)
3ab(a+b)
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A galaxy is a huge collection of gas, dust, and billions of stars and their solar systems. A galaxy is held together by gravity. Our galaxy, the Milky Way, also has a supermassive black hole in the middle. .
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