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Orbits are ellipses with the central body at one focus, and a highly elliptical orbit is one with an eccentricity close to 1 so that the orbiting body's distance and speed vary greatly.

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SUPPORTED
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Recorded sources
7 sources for · 0 against

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Is it true that orbits are ellipses with the central body at one focus, and a highly elliptical orbit is one with an eccentricity close to 1 so that the orbiting body's distance and speed vary greatly?

Yes. A Wikipedia reference states that orbits are ellipses with the sun at the main focus and that comets like Halley have highly eccentric, elongated orbits with eccentricity near 1, and a physics textbook confirms orbits are ellipses with the sun at one focus and that a planet's speed increases as it approaches its star.

Verdict: SUPPORTED · 7 sources for, 0 against · Last checked

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Evidence for · 7
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Elliptic orbit - Wikipedia. (n.d.). en.wikipedia.org. https://en.wikipedia.org/wiki/Elliptic_orbit

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More for · 6
2026
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Ben-Ari, M. (2026). Gravitation and Elliptical Orbits. doi.org. https://doi.org/10.1007/978-3-032-26272-1_3

2015
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Has any probe ever been launched into a highly elliptical orbit with say 20-30 year to orbit the sun?. (2015). space.stackexchange.com. https://space.stackexchange.com/questions/9978/has-any-probe-ever-been-launched-into-a-highly-elliptical-orbit-with-say-20-30-y

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A-level Physics (Advancing Physics)/Orbits. (n.d.). en.wikibooks.org. https://en.wikibooks.org/wiki/A-level_Physics_(Advancing_Physics)/Orbits

2017
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Christodoulou, D. M. (2017). Golden Elliptical Orbits in Newtonian Gravitation. arxiv.org. https://doi.org/10.48550/arXiv.1711.10119

2017
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On the co-orbital motion in the planar restricted three-body problem: the quasi-satellite motion revisited. (2017). hal.sorbonne-universite.fr. https://doi.org/10.1007/s10569-016-9749-1

2017
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Voyatzis, G., Tsiganis, K., & Gaitanas, M. (2017). The rectilinear three body problem as a basis for studying highly-eccentric systems. arxiv.org. https://doi.org/10.1007/s10569-017-9796-2

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