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| navigate by keyword : approach astronomy astrophysics calculations circular classical concept education elements elliptical equation formula formulas furnished galaxy gravity image infinity interstellar kinematics knowledge laws light math mathematical mathematics mechanics motion nasa nature outer physical physics pupil quantum research schemes school science scientific solution space spiral stars student study teacher texture theory this training trajectory universe university |
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| Science and research of the universe, spiral galaxy and physical formulas, concept of knowledge and education. Elements of this image furnished by NASA. |
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