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Each planet is attracted by the Sun's gravity.

A planet has its own forward speed, which causes it to tend to travel at constant speed in a straight line. The Sun's gravity pulls at right angles to the planet's forward speed, causing it to curve towards the Sun all the time.

Isaac newton proved that the curvature in the path followed is equivalent to acceleration towards the centre of curvature - the Sun in this case. He also proved that the amount of acceleration (curvature) is exactly explained by the law of gravity and the laws of motion.

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