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Q:

What is orbit eccentricity?

A:

Eccentricity is the measure of the "roundness" of an orbit. A perfectly circular orbit has an eccentricity of zero; higher numbers indicate more elliptical orbits. Neptune, Venus, and Earth are the planets in our solar system with the least eccentric orbits. Mercury and the dwarf planet Pluto have the most eccentric orbits.

Categories: Flight Dynamics