UNIVERSE
SATELLITESICY BODIES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Eccentricity is the ____
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changing of an orbit
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roundness of an orbit
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angle of an orbit
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None of the above
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Explanation:
Detailed explanation-1: -Eccentricity describes the “roundness” of an orbit. It is a ratio between the semi-minor axis and semi-major axis of an orbit. A “perfect” circular orbit has an eccentricity value of 0. The more eccentric the orbit (as e↑), the less circular the orbit.
Detailed explanation-2: -The key point is that the eccentricity cannot change. In a three or many body system the bodies perturb each others orbits and the eccentricity can change with time.
Detailed explanation-3: -In celestial mechanics, the eccentricity vector of a Kepler orbit is the dimensionless vector with direction pointing from apoapsis to periapsis and with magnitude equal to the orbit’s scalar eccentricity.
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