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Distance between planets

  1. Sep 2, 2006 #1
    Theoretically, what would be the closest one planet could safely exist away from another?
  2. jcsd
  3. Sep 3, 2006 #2


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    Gold Member

    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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