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Newton's first law of motion explains how objects stay at rest or in motion in a straight line unless acted upon by an outside force, with gravity being the force that prevents planets from moving straight into space.
Newton's first law of motion, also known as the law of inertia, states that objects either stay at rest or continue in motion in a straight line at a constant speed unless acted upon by an external force. In the case of planets, the force bending their paths and preventing them from moving in a straight line into space is gravity.
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