How close can planets safely exist from each other?

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Theoretically, what would be the closest one planet could safely exist away from another?
 

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Do you mean "in their orbits", or do you mean "sitting next to each other" (such as a double planet system)?

In their orbits, the closer they are the less long-term stability they'll have.

If orbiting each other, they'll have to be outside the Roche limit (wiki this).
 

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