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Astronomy

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  • $\begingroup$ Very similar question here: astronomy.stackexchange.com/questions/7861/… $\endgroup$
    – userLTK
    Commented Jun 12, 2016 at 9:33
  • $\begingroup$ You know what, LTK .. that QA does a superb job of (a) explaining the basic newtonian physics of shell orbits (and (b) "what would happen if they flew off.." sort of thing) and (c) that we can "see" these things by looking at the velocities towards/away from us on each side. However! Note in fact RobJeffries final comment: "That's a good question and I do not have the information to hand." indeed, that's just what I want to know here! $\endgroup$
    – Fattie
    Commented Jun 12, 2016 at 12:26
  • $\begingroup$ What do you mean by "CG"? $\endgroup$
    – Peter Erwin
    Commented Jun 13, 2016 at 18:40
  • $\begingroup$ Dear @PeterErwin - sorry: Center of Gravity. (I guess, that is somewhat common abbreviation in say engineering or video game engineering), cheers.... $\endgroup$
    – Fattie
    Commented Jun 13, 2016 at 18:52
  • 1
    $\begingroup$ @PeterErwin The barycentre of the solar system spends most of its time outside the Sun. $\endgroup$
    – ProfRob
    Commented Jun 14, 2016 at 22:58