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A heavenly body revolves around a massive star in a highly elliptical orbit. Ignoring mass loss of the heavenly body when it comes too close to the star, the angular momentum over the orbit is _____________

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A heavenly body revolves around a massive star in a highly elliptical orbit. Ignoring mass loss of the heavenly body when it comes too close to the star, the angular momentum over the orbit is _____________

(a) Zero

(b) Increasing

(c) Decreasing

(d) Constant

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Query is from Relation between Torque and Momentum in portion System of Particles and Rotational Motion of Engineering Physics I

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Best answer
Right option is (d) Constant

The best explanation: The heavenly body revolves around the massive star under the effect of gravitational force, which is purely radial. The torque exerted by such a force is zero. Hence the angular momentum of the heavenly body remains constant over its entire orbit.

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