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May 18, 2023 at 10:48 comment added uhoh @blademan9999 I think what you have to say is important enough, and will reach a lot more readers if you post it as a new answer.
May 18, 2023 at 10:04 comment added blademan9999 But my coment also applies to any passage near a star, Unless the star has a VERY low proper motion relative to the star, it will be possible for the asteroid to turn 180 degrees form the perspective of observers in the Sun's reference frame.
May 17, 2023 at 14:00 comment added uhoh @blademan9999 I think that a "rouge gas gianst travelling through the oort cloud" would not be considered "under normal situations". I think as written my statement is fine. Why not add a supplementary answer beginning with something like "While uhoh mentions 'normal situations' there are certainly other kinematic scenarios we can consider." I think that would be great! :-)
May 17, 2023 at 11:35 comment added blademan9999 "Under normal situations an asteroid or planet could not swing around a massive object, make a U-turn, and come straight back nearly along it's same path after a 180° deflection. " This is only true from the perspective of the reference frame where the object is stationary, from other reference frames the asteroid can appear to turn 180. A rouge gas gianst travelling through the oort cloud could give what is a 90 degree trun from it's reference frame but a 180 degree turn from the perspective of the sun's reference frame.
Dec 9, 2020 at 23:14 comment added uhoh It's rare for me to answer my own question and rarer-still for me to accept it, but as OP I feel this is the best answer. Please feel free to convince me otherwise!
Dec 9, 2020 at 23:13 vote accept uhoh
May 10, 2020 at 2:28 history edited uhoh CC BY-SA 4.0
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May 10, 2020 at 2:03 history edited uhoh CC BY-SA 4.0
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May 10, 2020 at 2:01 comment added uhoh Why the down vote? Is this not in fact a correct answer to What natural mechanisms could lead to the unlikely case of the same rogue asteroid or planet passing through our solar system twice?
Mar 20, 2019 at 2:32 history edited uhoh CC BY-SA 4.0
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Mar 19, 2019 at 12:41 history edited uhoh CC BY-SA 4.0
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Mar 19, 2019 at 9:14 history answered uhoh CC BY-SA 4.0