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The following is a list of planets declared too dangerous or unsafe for members of the Atlantis Expedition to visit or even return to after being visited for the first time due to the natives who are hostile or due to the fact that the planet itself no longer exists, the planet in question having been destroyed at some point, either accidentally or by the Wraith.
As such, they are regarded as planets off-limits to the personnel associated with the Expedition with their addresses having been presumably removed from Atlantis's dialing device.