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SCIENCE PHOTO LIBRARY SCIENCE PHOTO LIBRARY
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.
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