You have a close-in, Jupiter-sized object in the habitable zone, and an Earthlike planet in a horseshoe co-orbit. Every hundred years or so it would make an approach to the Jovian, there would be massive tides and portents and inundations and volcanoes, the length of the year would change a bit, and things would gradually settle down until next time. If it's in a close orbit around a dim star, the approach could happen more often.
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timeasmymeasure
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Date: 2012-02-04 10:14 pm (UTC)