Q13.12 A planet (P) is moving around the sun (S) in an elliptical orbit. As the planet moves from aphelion to perihelion, the planet's angular momentum A planet P follows an elliptical orbit. The sun S is at one focus of the ellipse. Perihelion Aphelion A. increases at all times. B. decreases at all times. C. decreases during part of the motion and increases during the other part. Kea There is nothing at the other focus. D. increases, decreases, or remains the same during various parts of the motion. E. remains the same at all points between aphelion and perihelion.

Q13.12 A planet (P) is moving around the sun (S) in an elliptical orbit. As the planet moves from aphelion to perihelion, the planet's angular momentum A planet P follows an elliptical orbit. The sun S is at one focus of the ellipse. Perihelion Aphelion A. increases at all times. B. decreases at all times. C. decreases during part of the motion and increases during the other part. Kea There is nothing at the other focus. D. increases, decreases, or remains the same during various parts of the motion. E. remains the same at all points between aphelion and perihelion.