Isaac Newton made many discoveries about motion. He showed that all moving objects will travel in a straight line at a constant speed unless acted on by an unbalanced force. What would happen to the planets if the sun had no gravity at all? *
A. The planets would continue to move in circular orbits around the sun.
B. The planets would leave their circular orbits and move in straight lines.
C. The planets would fall into the sun.
D. The planets would move randomly through space.