Final answer:
The semi-major axis of an orbit defines the average distance between the center of an elliptical orbit and its farthest point from the Sun.
Explanation:
The semi-major axis of an orbit is a fundamental parameter in celestial mechanics that defines the size of an elliptical orbit. It is the average distance between the center of the orbit and its highest point or aphelion. For example, an asteroid with a semi-major axis of 3 Astronomical Units (AU) would travel around the Sun with an orbital period of approximately 5.2 years.
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