* Newton’s first law of motion: A body continues in its state of constant velocity (which may be zero) unless it is acted upon by an external force.
* Newton’s second law of motion: For an unbalanced force acting on a body, the acceleration produced is proportional to the force impressed; the constant of proportionality is the inertial mass of the body.
* Newton’s third law of motion: In a system where no external forces are present, every action force is always opposed by an equal and opposite reaction
Given Newton’s First Law, especially in space, Earth will continue it is current path and motion until (hopefully not anytime soon) acted upon by another force. It is very possible that a catastrophic impact could cause earth to spin backwards (or ‘retrograde’ as Venus), but this would not happen on its own.
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