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Earth orbiting the Sun, illustration
Earth orbiting the Sun. Illustration showing the Earth moving around the Sun, its orbit determined by gravitational attraction. Newton's first law of motion states that a body remains at rest or in motion with a constant velocity unless an external force acts on the body. The gravitational force of attraction between the Earth and the Sun pulls the Earth into orbit around the Sun. A force that pulls an object towards the centre of a circle is called a centripetal force., by SCIENCE PHOTO LIBRARY
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