1. Define galaxy.
How is a star different from an
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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. ... This is the picture taken by the Hubble Space Telescope showing thousands of galaxies....
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A planet is a large body orbiting a sun. It has cleared its orbit of other objects. Though there are rogue planets which have been ejected from a solar system by other planets. A galaxy is a large number of stars orbiting about a central core.
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