作者君在作品相关中其实已经解释过这个问题。
不过仍然有人质疑——“你说得太含糊了”，“火星轨道的变化比你想象要大得多！”
那好吧，既然作者君的简单解释不够有力，那咱们就看看严肃的东西，反正这本书写到现在，嚷嚷着本书bug一大堆，用初高中物理在书中挑刺的人也不少。
以下是文章内容：
long-termiionsandstabilityofparyorbitsinoursorsystem
abstract
wepresenttheresultsofverylong-termnumeritegrationsofparyorbitalmotionsover109-yrtime-spansincludingalls.aquispeofournumericaldatashowsthattheparymotion，atleastinoursimpledynamicalmodel，seemstobequitestableevehisverylongtime-span.acloserlookatthelowest-frequencyosciltionsusingalow-passfiltershowsusthepotentiallydiffusivecharacterofterrestrialparymotion，especiallythatofmercury.thebehaviouroftheetriercuryinouriionsisqualitativelysimirtotheresultsfromjacquesskar'ssecurperturbationtheory(e.g.emax～0.35yr).however，therearenoapparentsecreasesofetricityorinationinanyorbitalelementsoftheps，whichmayberevealedbystillloermnumeritegrations.wehavealsoperformedacoupleoftrialiionsincludingmotionsoftheouterfivepsoverthedurationof±5x1010yr.theresultindicatesthatthethreemajorresoheune–plutosystemhavebeenmaintainedoverthe1011-yrtime-span.
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