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Two orbits share the same major axis, but one has its foci much further apart. That difference is measured by the:
AElasticity
BEfficiency
CElectricity
DEccentricity
Answer & Solution
Correct answer: D. Eccentricity
1. It measures how round or stretched the shape is.
2. Foci close together mean a rounder ellipse.
3. It is the eccentricity.
_Source: OpenStax Astronomy 2e, Chapter 3, Orbits and Gravity._
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