Lemma
MediumCurves in space
Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) §12.4 Polar Coordinates and Planetary Motion, #20 · Multivariable Calculus · Curves in space

True or false: (a) The paths of all comets are ellipses

True or false:
(a) The paths of all comets are ellipses.
(b) A planet in a circular orbit has constant speed.
(c) Orbits in central force fields are conic sections.

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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) · §12.4 Polar Coordinates and Planetary Motion, #20

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