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The Outer Worlds was a term referring to a group of planets at least partly under Federation control, as distinct from the Inner Worlds.

The degree to which the terms Outer Worlds and Outer Planets can be used interchangably is obscure.

Blake referred to an existing revolt in the Outer Worlds prior to his attack on Federation computer control.

The styling of the President of the Federation included the phrase Lord of the Inner and Outer Worlds.