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Recent knowledge of Galactic dynamics suggests that stars radially move onthe disk when they encounter transient spiral arms that are naturally generatedduring the process of disk formation. We argue that a large movement of thesolar system from the innermost disk over its lifetime is inferred from acomparison of the solar composition with those of solar twins within theGalactic chemical evolution framework. The implied metal-rich environment atthe Sun's birthplace and formation time is supported by measured siliconisotopic ratios in presolar silicon carbide grains. We perform numericalsimulations of the dynamical evolution of disk stars in a Milky Way-like galaxyto identify the lifetime trajectory of the solar system. We find that a solarsystem born in the proximity of the Galactic bulge could travel to the currentlocus by the effect of radial migration induced by several major encounterswith spiral arms. The frequent feature we identify is the repeated passages ofstars inside the same spiral arm owing to the wobble of stars traveling in andout of the spiral arms. We predict that such episodes are evidenced in theEarth's geological history as snowball Earth and that their occurrence timesare within our prediction. In particular, the stellar motion that verticallyoscillates during passages through spiral arms occasionally leads to a splitinto two discrete passage episodes with an interval of several tens of Myr,implying two relevant snowball Earth events that occurred in rapid succession(~7.2 and 6.5 hundred Myr ago).

Remarkable migration of the solar system from the innermost Galactic disk; a wander, a wobble, and a climate catastrophe on the Earth