The motion of planets in the solar system is an example of the conservation of

The motion of planets in the solar system illustrates the principle of conservation of angular momentum. This principle states that if no external torque acts on a system, its angular momentum remains constant. In the case of planets orbiting the Sun, the gravitational force between the Sun and the planets is always directed along the line joining them. Since the force is tangential to a circle, it creates no torque; therefore, it conserves angular momentum in the orbit of every planet.

This conservation explains why planets closer to the Sun move faster in their orbits, while planets farther away move slower. For example, Mercury, being close to the Sun, orbits more rapidly, while Neptune, at a much greater distance, moves slowly. The varying orbital speeds ensure that the product of the planet’s mass, velocity, and distance from the Sun remains constant.

The concept of conservation of angular momentum plays a significant role in astrophysics, leading to understanding planetary system stability. It applies not only to planetary motion but also to stars, satellites, and other celestial bodies. This concept shows how laws of physics apply to the immense and intricate dynamism of the universe with elegance and consistency.

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