It is reasonably well known that Mars has a greater obliquity range than Earth, due to Mars lacking a stabilising influence of a large moon. However, the Martian obliquity seems to have gone through periods of high and low mean obliquity, as shown in the top chart below:
Image source: Mars Climate Modeling Group
What is the current accepted theory as to why there are periodic high and low mean obliquities on Mars?
(Please note, I am not asking about orbital eccentricity)
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