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  • Understanding Planetary Orbits: The Role of Gravity
    The force that keeps planets orbiting the Sun is gravity.

    Here's how it works:

    * The Sun's Mass: The Sun is incredibly massive, meaning it has a strong gravitational pull.

    * Gravitational Attraction: Gravity is a force of attraction between any two objects with mass. The more massive an object is, the stronger its gravitational pull.

    * Centripetal Force: Planets are constantly moving, and their motion is influenced by the Sun's gravity. This gravitational pull acts as a centripetal force, pulling the planets towards the Sun, preventing them from flying off in a straight line.

    * Balance: The planet's forward motion (inertia) and the Sun's gravitational pull create a delicate balance. The planet's velocity is just right so that it constantly falls towards the Sun, but never actually hits it. It continues orbiting in an elliptical path.

    It's like a ball on a string:

    * The string is the Sun's gravity.

    * The ball is the planet.

    * The force of the string keeps the ball from flying off in a straight line.

    This is a simplified explanation, but it captures the basic principle of how gravity keeps planets in orbit around the Sun.

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