Assertion: motion's motion | /r/AtLocation | parabolic or hyperbolic orbits
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Source sentences:
text: Newton showed that the motion of bodies subject to central gravitational force need not always follow the elliptical orbits specified by the first law of Kepler but can take paths defined by other, open conic curves; the motion can be in parabolic or hyperbolic orbits, depending on the total energy of the body.