Newton's first law of motion says that planets continue to move in a straight line in the same direction until an outside force acts on them. Newton's law of universal gravitation says that planets are attracted to the sun by gravity. To obey both laws, the planets ___________. 

a. spin on their axis  

b. move in a straight line  

c. move in a circular or elliptical orbit  

d. stop moving

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The detailed answer for the above question is provided below The correct answer is c move in a circu... View the full answer