In 1 million years, this will happen.

Kelper’s biggest moon gets too close to Kelper and then it gets shot away very quickly. But its gravity pulls Kelper with it. This brings them closer to the sun and eventually it would get to Trappist. This would cause them to become binary and Clieo, Kelper's habitable moon would be passed from Kelper’s orbit to Trappist’s orbit.

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