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The term "cosmos" is often used to describe the entire physical universe, including all matter and energy.
The universe is one big organism. It depends on the smallest organism to do its part in the cycle of life.
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The word used to describe knowledge about the universe and the method of obtaining that knowledge is "science." Science is a systematic enterprise that builds and organizes knowledge in the form of testable explanations and predictions about the universe.
No, Newton did not describe the universe as a series of concentric spheres. He is best known for his work in physics, particularly his laws of motion and law of universal gravitation.
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Asteroids and Meteoroids were created when the universe was created or as a result of a collision.
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It doesn't really explain it as describe it. Think of the universe as sort of the smoke and debris that resulted from a massive explosion.