How close can planets safely exist from each other?

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In summary, the distance between planets varies depending on their orbits and positions in the solar system. It is typically measured in astronomical units (AU) or kilometers, with one AU being equal to the average distance between the Earth and the Sun. The closest planet to Earth is Venus, while the farthest is Neptune. The distance between planets changes due to their elliptical orbits, causing them to sometimes be closer or farther away from each other as they orbit the Sun.
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ghost77
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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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