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A comment on Military Has Been Researching "Anti-Gravity" For Nearly 70 Years. Parent comment

Re:Military Has Been Researching "Anti-Gravity" For Nearly 7... by TeMPOraL on Thursday October 31, 2019 @08:44AM (#21408104)
I would think that parabolic trajectories only close in infinity, and hyperbolic not even there? Or both close only in infinity? The math on that is currently out of my brain's cache.
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Re:Military Has Been Researching "Anti-Gravity" For Nearly 7... by rbanffy on Thursday October 31, 2019 @03:03PM (#21412404)
They all close. Worst case is they'll get longer and longer as the universe expands and the objects will never be able to complete them and come back for a second lap.
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