Answer: The planet is a celestial body that orbits around a star, such as the Sun. There are eight known planets in our solar system: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. Each planet has its own unique characteristics, including size, composition, and atmosphere.
Motion refers to the act of changing position or location. In the context of planets, motion refers to their movement around the Sun. This motion is called orbital motion or revolution. Planets follow elliptical paths known as orbits, with the Sun at one of the foci of the ellipse.
The motion of planets can be described using two main concepts: rotation and revolution.
1. Rotation: This refers to the spinning of a planet around its axis. Each planet rotates on its axis, which is an imaginary line passing through its center. The time it takes for a planet to complete one full rotation is called its rotation period. For example, Earth completes one rotation in approximately 24 hours, resulting in day and night.
2. Revolution: This refers to the planet's movement around the Sun. Each planet follows its own path and takes a specific amount of time to complete one revolution. This period is called the planet's orbital period. For example, Earth takes about 365.25 days to complete one revolution around the Sun, resulting in a year.
It is important to note that the motion of planets is influenced by gravitational forces. The Sun's gravitational pull keeps the planets in their orbits and governs their motion. The combination of the gravitational force and the planet's own momentum determines the planet's path and speed.
In summary, the planet is a celestial body that orbits around a star, and its motion refers to its rotation around its axis and its revolution around the Sun. Understanding the concepts of rotation and revolution helps us explain the movement and behavior of planets in our solar system.
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