Here's why:
* Orbit: The path an object takes around another object due to gravity.
* Ellipse: A closed curve where the sum of the distances from any point on the curve to two fixed points (called foci) is constant.
* Circular Orbit: A special case of an elliptical orbit where both foci coincide at the center of the circle.
Therefore, an oval orbit is just a more descriptive term for an elliptical orbit where the foci are slightly offset from the center.