Here are the correct inputs for each response to answer the question:
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Caused by Earth’s 23.5° tilt on its axis and its revolution around the sun: Seasons
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A large collection of gas and dust that is known as the birthplace of stars; recycled material from a star’s death: Nebula
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A system of gas, dust, planets, and millions or billions of stars: Galaxy
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A hot ball of gas that emits light through the process of nuclear fusion: Star