Which of the following correctly describes the hierarchy that exists in the universe? A galaxy refers to all existing matter, energy, and space that is held together by gravity. A galaxy is a collection of planets, their moons, and other objects in orbit around a central star. A solar system refers to all existing matter, energy, and space that is held together by gravity. A solar system is a collection of planets, their moons, and other objects in orbit around a central star.
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