Final answer:
If no force acted on the planets, they would follow a straight-line path called a tangential path.
Step-by-step explanation:
If no force acted on the planets, they would follow a straight-line path called a tangential path.
According to Newton's first law of motion, an object in motion will continue to move in a straight line with constant velocity unless acted upon by an external force. In the absence of any force, the planets would continue moving with their current velocity and direction in space.
However, in reality, there are various forces acting on the planets, such as gravity, which keeps the planets in orbit around the sun.
Learn more about planet motion