Here's a breakdown:
* Ellipse: An ellipse is an oval shape with two focal points. The Sun is located at one of these focal points.
* Not a perfect circle: This means that the distance between the planet and the Sun varies throughout the planet's orbit.
* Perihelion: The point in the orbit where the planet is closest to the Sun.
* Aphelion: The point in the orbit where the planet is farthest from the Sun.
Here's a visual representation:
[Image of an ellipse with the Sun at one focal point and the planet orbiting around it.]
Key points to remember:
* The shape of a planet's orbit is determined by its gravitational interaction with the Sun and other celestial bodies.
* All planets in our solar system have elliptical orbits, although some are closer to circular than others.
* The eccentricity of an ellipse determines how "stretched out" it is. A higher eccentricity means a more elongated orbit.
Let me know if you have any other questions about planetary orbits!
